The discovery of hadronic states with a manifestly exotic nature, 𝑃𝜓, 𝑃𝜓𝑠, 𝑇𝜓, 𝑇𝜓𝑠, and 𝑇𝜓𝜓, has given the field of spectroscopy a great boost in recent years. LHCb has been one of the major player in this field observing more than 15 exotic hadrons, thanks to its excellent detector performance which is optimized for the study of beauty and charm particles. In this talk, we will review several...
Many of the observed hadronic resonances qualify as candidate hadronic molecules. In this talk, I will discuss the features of hadronic molecules, and a survey of hadronic molecules made of a pair of heavy hadrons will be presented.
ALICE (A Large Ion Collider Experiment), one of the CERN Large Hadron Collider experiments, was originally designed to study the properties of the quark–gluon plasma (QGP), a deconfined state of quarks and gluons produced in heavy-ion collisions. The ALICE physics programme has been extended to cover a broader scope of observables related to Quantum Chromodynamics. In this overview, a...
Abstract: Over the last decade lattice QCD methodology has matured significantly
and precise first-principles calculations of the hadronic contributions to the muon g-2
are now possible. I will summarize the status of the hadronic light-by-light and the
hadronic vacuum polarization contributions and I will give an outlook on expected future
progress.
The decay rates of the X Y Z exotics discovered in the heavy quarkonium sector are crucial observables for identifying the nature of these states. Based on the framework of nonrelativistic effective field theory, we calculate the rates of semi-inclusive decays of heavy quarkonium hybrids into standard heavy quarkonia. We compute the contributions to the decay rates at leading and subleading...
Light-flavour hadrons constitute the bulk of particle production in high-energy hadronic collisions at LHC. Measurements of their transverse-momentum spectra, integrated yields, and relative abundances as a function of multiplicity provide crucial information on the hadronization process and on the properties of the system created in different collision systems. These multi-differential...
The MesonEx experiment seeks to take advantage ofthe high luminosity electron scattering reactions and large acceptance CLAS12 detector in Hall B of Jefferson Lab. Inclusion of the small angle electron detector allows the tagging of low Q^2 quasi-real meson photoproduction. The high resolution detector systems allow reconstruction of events with missing particles, allowing reactions with...
I will first review the recent theoretical and phenomenological progress of studying multiple parton scattering at the LHC in both pp and heavy-ion collisions. I will then breifly summarise the existing experimental measurements. Finally, I will try to highlight the first triple parton scattering study by observing the triple J/psi production process with the CMS detector, and the first double...
Quarkonium measurements in proton-proton (pp) collisions represent a fundamental tool for studying quantum chromodynamics (QCD), due to the involvement of both perturbative and non-perturbative regimes and their interplay in the resonance formation process. In p--Pb collisions, quarkonium production is sensitive to the nuclear modifications on parton distribution functions and potentially to...
In this talk, we review the recent progress on the numerical determination of the Hadronic Light-by-Light contribution to the anomalous magnetic moment of the muon discussing the role of experimental data on the accuracy of its determination.
We determine, from Lattice QCD, the elastic $\pi \pi$ scattering amplitude in the three possible isospin channels for various quark masses. We observe that the extraction of the $\sigma$ pole position is very challenging when the state becomes unstable. By performing a full dispersive analysis, we eliminate the systematic uncertainties associated with model extractions, constrain the low...
Improving the knowledge on how the strong interaction acts among hadrons is one of the frontiers in nuclear physics. A large amount of interactions among stable or unstable hadrons have not been measured yet and theoretical calculations with effective lagrangians and/or starting from first principles, with quarks and gluons as degrees of freedom, are still under development and in need of...
We study the interaction of meson-baryon coupled channels carrying quantum numbers of $\Omega_{cc}$ , $\Omega_{bb}$ and $\Omega_{bc}$ presently under investigation by the LHCb collaboration. The interaction is obtained from an extension of the local hidden gauge approach to the heavy quark sector that has proved to provide accurate results compared to experiment in the case of $\Omega_{c}$ ,...
In this talk, I will report our recent applications of XEFT to the study of decays of exotic hadrons near threshold: including the decay of \chi_{c1}(3872) and the strong decay of Tcc^+ and the consistency of their hadronic molecular description.
The hadronic contributions to the Standard Model prediction of the muon g-2 have been determined using data-driven approaches. This talk will give an overview of the hadronic cross section measurements relevant for the hadronic vacuum polarization contribution and the transition form factor measurements relevant for the hadronic light-by-light contribution.
We establish the existence of the long-debated f0(1370) resonance in the dispersive analyses of meson-meson scattering data. For this, we present a novel approach using forward dispersion relations, valid for generic inelastic resonances. We find its pole at (1245±40)-i(300-70+30) MeV in ππ scattering. We also provide the couplings as well as further checks extrapolating partial-wave...
Using the data sets above 4.0 GeV collected by the BESIII detector on the Beijing Positron Electron Collider, which corresponds a total integrated luminosity greater than 1.5fb-1, the hexaquark or di-baryon state is searched through e+ e- -> 2(p pbar)and e+ e- -> p p pbar nbar pi- + c.c.. We observed these two final states for the first time, and the Born cross sections ofe+ e- -> 2(p...
Strange hadrons constitute a unique tool for studying hadronization. While their production yield was first proposed as a clean signature of quark--qluon plasma formation in heavy-ion collisions, today the role of strangeness production in large and small collision systems is pivotal in understanding how a colored system streams into the observed gas of mesons and baryons. This started when...
In this presentation, we will discuss our benchmark test calculations of tetraquark states using several different few-body methods. These include the diffusion Monte Carlo (DMC), Gaussian expansion method (GEM), and resonant group method (RGM), within various nonrelativistic quark models such as Silvestre-Brac-Semay models and Salamanca chiral quark models. To investigate resonance states...
Close-to-threshold photoproduction $\gamma{}p\rightarrow{}J/\psi{}p$ probes small-size gluon configurations in the proton. Under certain assumptions it allows us to study the proton properties, as gluonic GPDs, anomalous contribution to the mass of the proton, gravitational form factors, and the mass radius of the proton. A careful comparison of the experimental data with the theoretical...
We have studied the meson-baryon interaction in the neutral $S=-2$ sector using an extended Unitarized Chiral Perturbation Theory, which takes into account not only the leading Weinberg-Tomozawa term (as all the previous studies in $S=-2$ sector), but also the Born terms and next-to-leading order contribution. Based on the SU(3) symmetry of the chiral Lagrangian we took most of the model...
Radiative corrections to one-meson tau decays have become relevant to test CKM unitarity, lepton universality, and non-standard interactions. In this work, we compute the radiative corrections to the $\tau^-\to (P_1,P_2)^-\nu_\tau$ ($P_{1,2}=\pi, K$) decays for the first time using Resonance Chiral Theory (R$\chi$T).
I will present relevant results for the QCD phase diagram, within a combined framework of Ward Identities (WI) and Unitarized Effective Theories. On the one hand, WI provide model-independent results for susceptibilities with direct consequences on the relation between chiral and $U(1)_A$ restoration, key to understand the nature of the transition. Those WI also allow to derive scaling...
We have a look at the $P_{cs}$ states generated from the interaction of $\bar D^{(*)} \Xi^{(\prime*)}_c$ coupled channels.
We consider the blocks of pseudoscalar-baryon $({\frac12}^+, {\frac32}^+)$ and vector-baryon $({\frac12}^+, {\frac32}^+)$,
and find $10$ resonant states coupling mostly to $\bar D \Xi_c, \bar D^* \Xi_c,\bar D \Xi'_c, \bar D^* \Xi'_c,\bar D \Xi^*_c$ and
$\bar D^*...
The R value, defined as the ratio of inclusive hadronic cross section over dimu cross-section from electron-positron annihilation, is an important quantity that contributes to the SM prediction of the muon anomalous magnetic moment, and in the determination of the QED running coupling constant evaluated at the Z pole. At BESIII, the R value is measured with a total of 14 data points with the...
The spectroscopy of charmonium-like states together with the spectroscopy of charmed and strange baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models [1, 2, 3]. An understanding of the baryon spectrum is one of the primary goals of...
NA61/SHINE is, at the moment, the only multipurpose fixed-target facility studying particle production properties at p+p and A+A at the CERN Super Proton Synchrotron. The main goals of the NA61/SHINE strong-interactions program are to discover the critical point of strongly interacting matter as well as to study the properties of produced particles relevant for the study of the onset of...
The measurement of exclusive$e^+e^-$ to hadrons processes is a significant part of the physics program of $BABAR$ experiment, aimed to improve the calculation of the hadronic contribution to the muon g−2 and to study the intermediate dynamics of the processes. We present the most recent studies performed on the full data set of about 470 $\text{fb}^{-1}$ collected at the PEP-II $e^+e^-$...
Hadronic resonances produced in high-energy collisions at the LHC are powerful tools to investigate our understanding of QCD as the field theory responsible for hadron formation and, at the same time, describe the state of strongly interacting matter formed in heavy-ion collisions. The ${{\rm f}_{0}(980)}$ resonance was observed several years ago in $\pi\pi$ scattering experiments. Despite a...
Indirect searches for new physics beyond the standard model employ precision measurements of low energy observables like for example the weak mixing angle expressed as $\sin^2 \theta_W$. There are several possibilities to measure this quantity, one is the measurement of a parity-violating asymmetry in elastic electron-proton scattering.
The P2 experiment at the upcoming Mainz energy...
Based on a sample of 10 billion J⁄ψ events collected with the BESIII detector, a partial wave analysis of the decay J⁄ψ □(→) γηη' is performed. An isoscalar state with exotic J^PC=1^(-+) quantum numbers, denoted as η_1 (1855), has been observed for the first time with statistical significance larger than 19σ. Its mass is consistent with the predicted mass of 1^(-+) hybrid from Lattice QCD....
The Electron-Ion Collider in China (EicC) will be constructed based on the upgrade of the High Intensity Heavy-ion Accelerator Facility (HIAF), which is now under construction in Huizhou of Guangdong. The Collider will provide a large integrated experimental platform for research on nuclear and particle physics and related scientific fields. Electron-nucleon scattering is an ideal tool to...
The exclusive double pion electromagnetic production is an important tool for the study of N and 𝛥 excitations and for the search of missing baryonic resonances. In fact, in photoproduction reactions the two pion channel represents the dominant contribution to the total cross section, therefore favoring, especially in the second resonant region, the observation of intermediate states whose...
The Beijing Electron Positron Collider II (BEPCII) has achieved a series of achievements in high energy physics study. Along with the deepening of the research, more important physcis is expected in higher energy region (>2.1GeV). As the upper limit of BEPCII design energy is 2.1 GeV, an urgent upgrade is required. In this paper, the upgrade project of BEPCII (BEPCII-U) will be introduced.
The future MOLLER experiment will measure the parity-violating asymmetry forMøller scattering improving on the previous measurement E158 at SLAC by a factor of five. This measurement will yield the most precise measurement of the weak mixing angle at energies well below the scale of electroweak symmetry breaking. This new result would be sensitive to the interference of the electromagnetic...
We present a simple alternative to the relativistic Breit–Wigner distribution that (i) contains left-threshold effects, (ii) is properly normalized for any decay width, (iii) can be obtained as an appropriate limit in which the decay width is a constant, (iv) is easily generalized to the multi-channel case (v) as well as to a convoluted form in case of a decay chain and (vi) is simple to deal...
Neutron stars and explosive astrophysical systems - such as supernovae
or compact star binary mergers - represent natural laboratories where
extreme states of baryonic matter are populated. Modeling such
environments assumes, among others, good understanding of zero and
finite temperature equations of state (EoS). In this talk I shall first
discuss the relation between...
with a focus on Machine Learning (ML) based optimizations of the TPC dE/dx response
One important step in understanding the baryon spectrum is a precise knowledge of the excited states and their decays. In order to extract the contributing resonances from experimental data a partial wave analysis needs to be performed. To resolve ambiguities, the measurement of polarization observables is indispensable. In the regime of high mass baryon resonances multi-meson final states are...
Coherent elastic neutrino-nucleus scattering (CEνNS) is a process in which MeV energy scale neutrinos scatter on a nucleus, which behaves as a single particle. Within the Standard Model (SM), CEνNS is described by the neutral current interaction of neutrinos and quarks, and, due to the nature of couplings, its cross-section is proportional to the neutron number squared. In 2017, the COHERENT...
The Solenoidal Large Intensity Device (SoLID) is a forward-scattering spectrometer located in Hall-A at Jefferson Lab. With its large acceptance and full azimuthal angular coverage, SoLID is capable of handling high luminosities ranging from 1037 to 1039 /cm2/s, using both polarized and unpolarized targets. The detector makes use of the full potential of the JLab 12 GeV upgrade and is designed...
In this work, we interpret the newly observed $\eta_1(1855)$ resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in the $I=0$ sector, reported by the BESIII Collaboration, as a dynamically generated state from the interaction between the lightest pseudoscalar mesons and axial-vector mesons. The interaction is derived from the lowest order chiral Lagrangian from which the Weinberg-Tomozawa...
We report the recent results of spectroscopy of deeply bound pionic atoms. After elaborate analyses, we deduced the chiral condensate at the nuclear saturation density to be reduced by a factor of 60+-3% (T. Nishi, K. Itahashi et al., Nat. Phys. (2023) doi:10.1038/s41567-023-02001-x). We also discuss our future plans to make the spectroscopy in the inverse kinematics.
Recent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The $s$-wave scattering lengths with both total isospins $I=1/2$ and $I=3/2$ are inferred from the finite-volume spectrum below the inelastic threshold together with the $I=3/2$ $p$-wave containing the $\Delta(1232)$ resonance. A lattice QCD computation employing a combined basis of...
Neutron EDM (nEDM) is one of the most promising ways to probe CP-violating quark and gluon interactions and constrain potential extensions of the Standard Model. While nucleon models and low-energy theories provide some ballpark estimates for the nEDM sensitivity to these interactions, they may vary by an order of magnitude or more. Such theoretic uncertainties can only be eliminated by ab...
Glueballs are still an experimentally undiscovered expectation of QCD. Various theoretical approaches (most famously Lattice QCD) predict a spectrum of glueballs. The tensor ($J^{PC}=2^{++}$) glueball is the second lightest, behind the scalar glueball.
Here, using a chiral hadronic model, we compute decay ratios of the tensor glueball into various meson decay channels. We find the tensor...
$\eta^{\prime}$(958) meson has an exceptionally large mass among pseudoscalar mesons.
The origin of the large mass is considered to be a result of the chiral symmetry breaking and $\mathrm{U}_A(1)$ anomaly.
Many theoretical studies predict the mass reduction of the $\eta^{\prime}$ meson ranging in 37 MeV/$c^2$-150 MeV/$c^2$ in a nuclear matter where the chiral symmetry is partially restored....
The LHCb spectrometer has the unique capability to function as a fixed-target experiment by injecting gas into the LHC beampipe while proton or ion beams are circulating. The resulting beam-gas collisions cover an unexplored energy range that is above previous fixed-target experiments, but below the RHIC or LHC collider energies. Here we present recent results on open charm, $J/\psi$, and...
Experimental results on the electromagnetic form factors are very useful to constrain the QCD-based theoretical models. The electron-positron collider experiments are powerful tools to study the EMFFs of various baryons in time-like via energy scan or ISR-return methods.In this talk, we will report recent progress of baryon EMFFs in time-like from various experiments, BESIII, Belle, SND and...
This presentation will open with a brief review of lattice QCD calculations showing the 2s radial excitation of the nucleon sits at ~1.9 GeV, well above the Roper resonance position. We’ll then proceed to reconcile this observation with experimental scattering data, gaining insight into the interplay between quark-model states, meson-baryon interactions and the nature of baryon...
In this talk I will review some of the recent advances that Effective Field Theories had done in hadron spectroscopy regarding exotic states. The hidden gauge formalism has been able to predict
several exotic states, like the pentaquarks, and flavour exotic states, as doubly charmed states and the recently observed $T_{cs}(2900)$. Some of these states are been also searched for in latticeQCD....
I will summarize 10 years of JPAC operations, and discuss its philosophy and future.
Recent results on B_c production and decays from the proton-proton collision data taken by the ATLAS and CMS experiments will be presented.
The NA62 experiment at CERN collected the world’s largest dataset of charged
kaon decays in 2016-2018, leading to the first measurement of the branching
ratio of the ultra-rare K+ → π+ν ̄ν decay, based on 20 candidates, and presented
in 2021. In this talk the NA62 experiment reports new results from analyses
of K+ → π+μ+μ− and K+ → π+γγ decays, using a data sample recorded in
2017–2018....
At BESIII, the lineshapes of e+e- ->phi eta', phi eta, KK, omega pi0, eta pipi, omega pipi are measured
from 2.0 to 3.08 GeV, where resonant structures are observed in these processes. Multiple lineshapes of
intermediate state are obtained by a partial wave analysis of e+e- ->K+ K- pi0 pi0, K+K- pi0 and the
structures observed provide essential input to understand the nature of...
The elementary YN interaction remains of significant and continuing interest in nuclear physics. On the one hand, it is important to understand hadron dynamics in which the strange quark is involved and to construct a comprehensive picture of the baryon-baryon interaction. On the other hand, reliable YN potentials are needed for in-medium calculations, such as of hypernuclear structure and the...
Recent results published in [Nature Physics (2019)][1] by the BESIII collaboration revealed a substantial discrepancy of the Lambda baryon decay parameter with respect to the world average at the time.
We took this development as the starting point for a feasibility study of [CP violation tests in strange baryon decays][2] at next generation J/ψ factories. The proposed formalism allows for a...
Lattice QCD has made tremendous progress both in the simulation of gauge ensembles as well as in the analysis of more challenging quantities that probe the 3D structure of hadrons like the generalised parton distributions (GPDs) but also in calculating quantities that potentially can reveal new physics, like the muon anomalous magnetic moment reaching a precision that matches the...
This presentation will cover the branching fraction measurements of chi_cJ -> phi phi (J=0,1,2), eta_c(2S) -> pi+ pi- eta, chi_cJ -> Omega+ antiOmega- (J=0,1,2), and psi(3770) -> eta J/psi. The first three measurements are benefitted from the huge psi(2S) samples collected at BESIII and the transitions from psi(2S) to chi_cJ or eta_c(2S). The last one is based on e+ e- annihilation data sample...
With the large datasets on 𝑒+𝑒−-annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been...
The COMPASS experiment is a multi-purpose fixed-target experiment at the CERN SPS. Part of its physics program is the study of non-strange light mesons produced via diffractive scattering of $190\,\mathrm{GeV}/c$ $\pi^{-}$ off a liquid-hydrogen target. This gives access to the excitation spectrum of all isovector mesons $a_J$ and $\pi_J$ in multiple final states. The spin-exotic meson...
Generalized Parton distributions (GPDs) correlate the transverse position and the longitudinal momentum fraction of the partons in the nucleon. Over the last two and a half decades, there have been extensive studies of these distributions functions based on different exclusive lepton scattering reactions. The most established reactions are deeply virtual Compton scattering (DVCS), where a real...
The spectrum of QCD is expected to contain, besides bound states of quarks, also bound states of gluons. These glueballs can mix with other states that have the same quantum number. For pure Yang-Mills theory, on the other hand, glueballs are the only physical degrees of freedom which makes the picture much clearer. Using state-of-the-art, parameter-free solutions for the propagators and...
Study of the hyperon-nucleon (YN) interactions is vital to expand our knowledge on the nucleon-nucleon (NN) interaction to the generalized baryon-baryon (BB) interactions within the SU(3) flavor symmetry. It leads to an essential understanding of the baryon-baryon interactions as the interactions between quark clusters. Such inter-quark interactions should play an essential role in generating...
The axion is a hypothetical new particle that could explain the absence of CP violation in QCD and has a very rich cosmological phenomenology. In particular a population of thermally produced axions is expected to exist, in addition to a cold dark matter population. I discuss a new conservative bound on the axion mass, from production in the early universe through scattering with pions below...
BESIII has collected 2.93 and 7.33 fb^-1 of e+e- collision data samples at 3.773 and 4.128-4.226 GeV, which provide the largest dataset of DDbar and DsDs pairs in the world, respectively.
In this talk, we will report the updated measurements of |Vcs| in Ds+->tau+ nu and the form factor studies in Ds+->K+K- e+ nu and pi+pi- e+ nu. In addition, we will report the most updated amplitude...
Ds0(2317) and Ds1(2460) have long been conjectured to be DK and DK bound states. In this talk, we show that their productions in B decays can be well explained with the triangle mechanism in the molecular picture. Furthermore, we show for the first time that their prompt production yields in electron-positron collisions can be explained in the coalescence model. The comparison with the...
We examine whether an isovector vector meson with a mass around 1.26 GeV or $\rho(1250)$ is seen in the $e^{+} e^{-} \rightarrow \omega \pi^{0}$ process, whose existence was recently reinforced with a multichannel and fully unitary S-matrix analysis of elastic $\pi\pi$ scattering data with crossing-symmetry constraints by Hammound et al. [1]. The combined cross section data of that process...
Studies of nucleon resonance (N) electroexcitation amplitudes (gvpN electrocouplings) within a broad range of virtual photon four-momentum squared Q2 offer unique information on many facets of the strong interaction in the regime of large QCD running coupling (sQCD regime) seen in the generation of different resonances. The results on the gvpN* electrocouplings from exclusive meson...
The COMPASS experiment at CERN's Super Proton Synchrotron has been a key player in the quest for understanding the spectrum of light mesons. Using a high-energy pion beam, an unprecedented data set on diffractively produced isovector mesons was recorded. In addition to extending our knowledge on ordinary mesons, the data also allow us to search for exotic states not fitting the ordinary quark...
BDX-MINI is a beam dump experiment performed at Jefferson Lab, aimed at searching for Light Dark Matter in the MeV-GeV mass range. Dark Matter is expected to be produced by the interaction of CEBAF high-intensity 2.176 GeV beam with the Hall A beam dump at Jefferson Lab.
The detector, installed in a well located 22 m downstream of the Hall-A beam dump, consists of a PbWO4 electromagnetic...
Inspired by the recent observations of $T_{c\bar{s}0}^{0/++}$ in the the processes $B^0\to\bar{D}^0 D_s^+ \pi^-$ and $B^+\to D^- D_s^+ \pi^+$ by LHCb Collaboration, we investigate the decay properties of the $T_{c\bar{s}0}^{0}$ in a $D^{*}K^{*}$ molecule scenario, and the widths of $T_{c\bar{s}0}^{0}\to D^{0}K^{0}$, $D_{s}^{+}\pi^{-}$, $D_{s}^{*+}\rho^{-}$, $D_{s1}^{(\prime)+}\pi^{-}$, and...
KLOE and KLOE-2 collected the largest dataset at an electron-positron collider operating at the $\phi$ resonance peak ($\sim$ 8 fb$^{-1}$),
corresponding to the production of about 24 billion of $\phi$ mesons, namely 8 billion pairs of neutral K mesons and 300 million $\eta$ mesons.
A wide hadron physics program, investigating rare meson decays, $\gamma\gamma$ interaction, and dark...
In this talk, we present the numerical solution of the Schwinger-Dyson equation (SDE) for dynamical
quark masses and the homogeneous Bethe-Salpeter equation
for ground-state meson masses. Based on this analysis, we computed
the masses of light hadrons (pion, rho, and kaon) for a higher number of light quark flavors
$N_f$ and for a higher number of colors $N_c$. A...
A simple constituent model of gluodynamics that is motivated by lattice field theory and the QCD Hamiltonian in Coulomb gauge is applied to descriptions of hybrid meson flavor mixing and vector hybrid configuration mixing. Good agreement with lattice gauge computations is obtained for flavor multiplet masses, while mixing angles are in approximate agreement, given large errors. The...
We study the time evolution of the number of charm mesons after the kinetic freeze-out of the hadron gas produced by a central heavy-ion collision. The $\pi D^*\to \pi D^*$ reaction rates have t-channel singularities that give contributions inversely proportional to the thermal width of the $D$. The ratio of the $D^0$ and $D^+$ production rate can differ significantly from those predicted...
Hypernuclear structure studies have been progressing steadily through the $K$- and $\pi$-induced production reaction experiments, especially by the recent $\gamma$-ray coincidence measurements with the large volume Ge detector. Moreover a series of recent $(e,e' K^+)$ reaction experiments from the Jefferson Laboratory provide high-resolution data of the low-lying energy levels for $p$-shell...
Dark Matter (DM) is one of the biggest unanswered questions in modern physics. Despite the astrophysical and cosmological observations suggesting its existence, to date no particle physics experiment detected an unequivocal DM signal, shedding light on its fundamental properties. Among the different hypothetical DM models, vector-mediated Light Dark Matter (LDM) is a compelling paradigm,...
The world’s largest sample of J/ψ events accumulated at the BESIII detector offers a unique opportunity to investigate η and η′ physics via two body J/ψ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in η/η′ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including the observation...
The talk will report on the observation of the decay of the eta meson to four muons
Experimental investigation of the strong interaction in the low-energy regime is mandatory to constrain models of the low-energy meson-baryon interaction, with implications in several fields, ranging from the search for exotic mesic nuclear bound states, to the structure of compact astrophysical objects like the neutron stars.
In this talk we will review the studies performed by the AMADEUS...
Neutrinoless double-beta decay ($0\nu\beta\beta$) is a hypothetical nuclear decay that is only possible if the neutrino is a Majorana fermion. This decay can be mediated either by a light Majorana neutrino propagating between two electroweak current insertions or by higher-dimension short-distance operators that appear in some beyond the Standard Model theories. Experimental searches for...
At SPring-8 LEPS2 beamline, a linearly polarized photon beam is available in the tagged energy range of 1.3–2.4 GeV. In this facility, the BGOegg experiment has been carried out using a detector setup with a large-acceptance electromagnetic calorimeter, which has the world’s best resolution in the energy range around 1 GeV. A main physics subject in this experiment is the spectroscopy of...
The theoretical description of the strong interaction between quarks and gluons that form hadrons is provided by Quantum Chromodynamics. However, the impact of gluonic excitations on the characteristics of hadrons and their role in hadronic structure is yet to be determined.
Recent discoveries of several possibly exotic hadrons highlight the significance of precise spectroscopic measurements...
The spectral reconstruction of Euclidean correlation functions is an alternative to standard lattice QCD analyses. Using this approach, inclusive hadronic decays are determined directly from first principles, including the $R$-ratio and hadronic decays of the tau-lepton. The computed decay rates are smeared with a known kernel, the achievable resolution of which is related to the spatial...
The high-intensity beams provided by the CERN SPS in a wide energy interval offer a unique opportunity to investigate the region of the QCD phase diagram at high baryochemical potential. The fixed-target NA60+ experiment, proposed for taking data with Pb-Pb and p-A collisions at the SPS from 2029, aims at measurements of rare probes of the Quark-Gluon Plasma (QGP) in a beam-energy scan, in the...
The increasing number of discovered heavy quark exotic hadrons call for immediate theoretical investigations based on first principles. Our study focuses on tetra-quark states made up of a bottom and charm quark in the axial-vector ($1^+$) channel with isospin I=0, using Lattice Quantum Chromodynamics.
These computations were conducted on the state-of-the-art MILC ensembles using dynamical...
Hadronic spectral densities play a pivotal role in particle physics, a primer example being the R-ratio defined from electron-positron scattering into hadrons. To predict them from first principles using Lattice QCD, we face a numerically ill-posed inverse problem, due to the Euclidean signature adopted in practical simulations. Here we review the status of recent numerical approaches to the...
The study of the excited states of the nucleon is a powerful tool for the understanding of its structure in the non-perturbative regime of QCD, which is one of the major challenges of modern physics.
Meson photoproduction, as well as other photon-induced reactions, allow to study the excitation spectra of the nucleons and, in combination with the use of a polarized beam and/or target, allow...
An electric dipole aligned along the spin axis of a fundamental particle, nucleus, or atomic system violates both parity conservation and time reversal invariance. The observation of such a phenomenon would, at present or proposed levels of experimental sensitivity, signal new physics beyond the Standard Model.
The usual method for identifying an electric dipole moment (EDM) in such...
Since the discovery of neutrino oscillations, the search for neutrinoless double beta decay stands among the highest priorities for understanding the nature of neutrinos and the origin of their mass. The experimental observation of this lepton-number-violating process, only hypothesised so far, would demonstrate that neutrinos are Majorana fermions, equal to their own antiparticles. This in...
Kaonic atoms represent a unique laboratory for the study of the antikaon-nucleus interaction at threshold and investigate the low-energy quantum chromodynamics (QCD) in the strangeness sector. State-of-the-art X-ray detectors and modern experimental techniques allow to perform high-precision X-ray kaonic atoms spectroscopy, leading to fundamental input for nuclear, particle, and astrophysics...
The $Y(2175)$, recently renamed to $\phi(2170)$, is one of the rare exotic candidates connected to strangeonium instead of the heavier charmonium-like and bottomonium-like exotic states. Originally observed in initial-state radiation by the BaBar experiment in 2006, it is could be a strange partner of the famous charmonium-like exotic vector state $Y(4260)$. Various interpretations exist in...
We have studied the contribution of the state $X(3930)$, coming from the interaction of the $D \overline{D}$ and $D^{+}_s D^{-}_s$ channels, to the $B^- \to K^- J/\psi \omega $ decay. The purpose of this work is to offer a complementary tool to see if the $X(3930)$ state observed in the $D^+ D^-$ channel is the same or not as the $X(3960)$ resonance claimed by the LHCb collaboration from a...
Data on the photo- and electroproduction of different hadrons provide access to the spectrum of excited baryons. The amplitudes and resonance properties obtained through this phenomenological analysis can serve as a point of comparison for theories and models of excited baryons and their dynamics. Recent results from the Julich-Bonn-Washington model will be presented, including extensions to...
We investigate the constraints on the kaonic atom optical potential deduced from the latest extremely high precision data of the 2p states of the kaonic $^3$He and $^4$He atoms [1].
In our analyses, we consider the phenomenological optical potentials proportional
to the nuclear density distributions, and the potentials inspired by the theoretical studies of the chiral unitary model and...
Hadronic spectral densities play a pivotal role in particle physics, a primer example being the R-ratio defined from electron-positron scattering into hadrons. To predict them from first principles using Lattice QCD, we face a numerically ill-posed inverse problem, due to the Euclidean signature adopted in practical simulations. Here we present a recent numerical analysis of the vector...
Magnetic and electric dipole moments of fundamental particles provide powerful probes for physics within and beyond the Standard Model. For the case of charm baryons these have not been experimentally accessible to date due to the difficulties imposed by their short lifetimes. An experimental test at the insertion region 3 of LHC is foreseen during Run3 to demonstrate the feasibility of a...
The identification of exotic states in the charmed quark sector has generated great interest in the hadron physics community. Despite some very clear signals, many questions now arise, particularly with regard to the exact nature of as well as the existence of specific states. A hindrance to this is the fact that almost all of the states are only seen in single production mechanisms,...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double-beta (0$\nu\beta\beta$) decay that has been able to reach the one-tonne mass scale. The detector, located at the LNGS in Italy, consists of an array of 988 TeO$_2$ crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data...
Decays of the neutral and long-lived η and η′ mesons provide a unique, flavor-conserving laboratory to test low-energy Quantum Chromodynamics and search for new physics beyond the Standard Model. The program will be realized with the Jefferson Lab Eta Factory (JEF), scheduled to run in 2024 in Hall D at Jefferson Lab. The experiment will use the GlueX apparatus with an upgraded Forward...
Studies of the e+e- annihilation into open-bottom final states are very important for understanding of the properties and nature of the bottomonium and bottomonium-like states. We report the first measurement of the inclusive σ(e+e− → bb̄ → DsX) and σ(e+ e− → bb̄ → D0X) cross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determine σ(e+ e− → Bs X) in the same...
In this presentation we would like to determine the properties of the lightest resonance in the baryonic sector of QCD: the Delta(1232) resonance. We determine the finite volume energy spectrum of $\pi-N$ system. Using Luescher formalism we can predict the mass and the width of the delta resonance. In our analysis we include ensembles with the same pion mass at different spatial volume...
The near threshold region of heavy quarkonium has received a lot of attention with possible applications to a wide breadth of physics. I will discuss the recent JPAC analysis of new Jefferson Lab data from the GlueX and Jpsi-007 experiments. I will discuss the still wide array of physics scenarios that may underpin the near threshold data including strong coupled channel effects to open charm...
A high-intensity GeV gamma beam line, LEPS2, was constructed at SPring-8 in Japan in 2013. A large acceptance solenoidal spectrometer has been constructed to detect charged particles, neutrons, and photons. Since 2021, physics data has been collected in order to study kaonic nuclei, and exotic hadrons. Photoproduction of hyperon resonances and mesons has been successfully observed. In this...
The famous exotic hadron $X(3872)$ (a.k.a. $\chi_{c1}(3872)$) is observed not only in $J/\psi \pi \pi$ but also in $D^0\bar{D}^{*0}$, and the observed mass and width are larger in the latter decay mode with sizable uncertainties. In this presentation, we report a new measurement on
$X(3872) \to D^0\bar{D}^{*0}$ decay using the full data of the Belle experiment and show the result of an...
LHCb has collected the world's largest sample of heavy flavour hadrons. This sample is used to search for and measure the CP violation in heavy flavour decays. The latest LHCb results of CP violation in charm and beauty decays are presented, as well as prospects for future sensitivities.
The Belle II experiment at the SuperKEKB collider has been collecting asymmetric-energy electron-positron collisions at the $\Upsilon$(4S) at the world's highest intensities since 2018. A data sample comparable in size to that of predecessor experiments, collected with a novel detector and analyzed with advanced analysis techniques, provides unique or world leading results in indirect searches...
I will review lattice QCD results on spectroscopy of conventional and exotic hadrons that contain heavy quarks. These theoretical studies are particularly motivated by the experimental discoveries of exotic hadrons, most of which contain heavy quarks.
Hadrons have been understood as a quark-gluon composite state bound by the strong interactions, which is one of the interesting phenomena in the low-energy QCD. In the ordinary hadron picture, baryons and mesons are explained as a three-quark state and quark-antiquark state, respectively. In fact, nucleons (protons and neutrons) can be understood as uud and udd baryons. However, accelerator...
I will report on recent theoretical studies and ongoing work on the interpretation of exotic mesons and pentaquarks in terms of quark states or hadron molecules.
We are going to complete the construction of the S-2S spectrometer at the K1.8 beam line in J-PARC hadron hall, in May, 2023. The S-2S spectrometer is composed of "QQD" magnets to measure the missing-mass spectrum of $^{12}$C$(K^-,K^+)^{12}_{\Xi}$Be reaction with a good energy resolution of 2 MeV(FWHM), which is so far the best energy resolution applied for the reaction. The existence of...
Amplitude analysis is a powerful method for studying the intermediate processes of particle decays. However, considering the full kinematics, it can be a complex task that requires a deep understanding of particle physics. With the high statistics data provided by BESIII, analyzing this data simply and efficiently is a significant challenge. In this talk, we will provide a review of the...
A key step toward a better understanding of the nucleon structure is the study of Generalized Parton Distributions (GPDs). The particularity of GPDs is that they convey an image of the nucleon structure where the longitudinal momentum and the transverse spatial position of the partons inside the nucleon are correlated. Moreover, GPDs allow the quantification, via Ji's sum rule, of the...
The talk will report the most recent results by CMS on conventional heavy baryons
Hadronic and radiative decays of light mesons decays offer a privileged environment to test QCD and search for physics beyond the Standard Model.
A new generation of precision experiments in hadron physics will soon offer new data that will have an impact on determinations of fundamental QCD parameters, such as the ratio of light quark masses or the $\eta$-$\eta^{\prime}$ mixing parameters,...
Angular (ΔηΔφ) correlations of identified particles measured in ultrarelativistic proton-proton and heavy-ion collisions exhibit a number of features which depend on the collision system and particle type under consideration. Those features are produced by various mechanisms, such as (mini)jets, elliptic flow, resonance decays, and conservation laws. In addition, of particular importance are...
The talk will report on the new results on fully-charmed exotic states in $J/\psi J/\psi$ final state by ATLAS and CMS
Precision tests of the Standard Model with beta decays and unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix offer a way to search for BSM signals, which is competitive and complementary to the collider searches. Currently, the CKM top-row unitarity constraint shows a deficit $\Delta_u=|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2-1=-0.0015(7)$ which may point to possible New Physics...
Scattering cross section measurements have been used to study the strong interaction between charged kaons and deuterons. However, these studies have not been successful in determining the scattering lengths of the strong interaction between $\rm K^{+}d$ and $\rm K^{-}d$. Moreover, the currently available theoretical predictions for this $\rm K^{-}d$ scattering parameter are largely based on...
Double-Λ and Ξ hypernuclei : Findings and Prospects
Kazuma Nakazawa 1, 2
1 High Energy Nuclear Physics Laboratory, RIKEN
2 Faculty of education, Gifu University, Japan
Since the discovery of the doubly-strange hypernucleus in 1963, many efforts have been made but no new discoveries have been made. In the 1980s, we...
QCD supports the existence of hadrons with a structure richer than quark-antiquark mesons and three-quark baryons that are conventionally referred to as exotic. Many candidates for such states have been discovered experimentally in the spectrum of heavy quarks, with their minimal quark content being four-quark: two heavy plus two light quarks. In addition, recent results of the LHCb...
In this work, we study the charm and bottom lowest-lying
${\frac{1}{2}}^-$ and ${\frac{3}{2}}^-$ $\Lambda_{Q}$ resonances
using a model which considers the interplay between the nearest
baryon-meson and bare constituent quark model (CQM) degrees of
freedom. For the former ones, we only consider the scattering of
pions off $\Sigma_Q^{(*)}$ baryons. In addition, we constrain...
The light-cone definition of Parton Distribution Functions (PDFs) does not allow for a direct ab initio determination employing methods of Lattice QCD simulations that naturally take place in Euclidean spacetime. In this presentation we focus on pseudo-PDFs where the starting point is the equal time hadronic matrix element with the quark and anti-quark fields separated by a finite distance. We...
The system of light pseudoscalar mesons π0, η and ηꞌ provide a unique laboratory to probe fundamental QCD symmetries at the confinement scale. While π0 and η are Goldstone bosons due to spontaneous chiral symmetry breaking, ηꞌ is not due to an axial U(1) anomaly coupling to the gluon field. The chiral anomaly coupling to the electromagnetic field drives the two-photon decays of these mesons....
The three-particle $K$-matrix, $\mathcal{K}_{\mathrm{df},3}$, is a scheme-dependent quantity that parametrizes short-range three-particle interactions in the relativistic-field-theory three-particle finite-volume formalism. In this talk, I briefly present our earlier calculation of the six-pion amplitude at next-to-leading order (NLO) in Chiral Perturbation Theory (ChPT) and our recent...
Missing mass spectroscopy of Λ hypernuclei using the (e,e′K+) reaction has been performed at the Thomas Jefferson National Accelerator Facility (JLab) with several experiments in the past in Hall A and Hall C.
One experiment, expected to run in 2026 in Hall C, will provide the first study of the isospin dependence in medium-mass hyperisotopes by populating Λ-K-40 and Λ-K-48 using an...
The sensitivity of the rare decays $\eta^{(\prime)}\to\pi^{0}\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$ to signatures of a leptophobic $B$ boson in the MeV-GeV mass range is analyzed in this work.
By adding an explicit $B$-boson resonance exchange, $\eta\to B\gamma\to\pi^{0}\gamma\gamma$, to the Standard Model contributions from vector and scalar meson exchanges,and employing...
We present a quark model analysis of $S$- and $P$-wave baryon states with one, two and three heavy quarks ($Q=c$, $b$) in the framework of the harmonic oscillator quark model. The study of heavy baryons is based on masses, electromagnetic and strong couplings. The results are found to be in good agreement with the available experimental data.
LHCb results on four-charm quark tetraquarks - abstract to be determined
Recently, the LHCb collaboration has computed the aligned polarimeter vector field for the dominant hadronic decay mode of the $\Lambda_c$ baryon (arXiv:2301.07010). The polarimeter vector field is a model-independent representation of the decay rate for polarized decays that can be used to measure polarisation and to improve the sensitivity of amplitude...
The femtoscopic technique provided insights into the previously experimentally inaccessible strong interaction between hadron pairs, including strangeness or charm. The ALICE Collaboration has, for the first time, extended such measurements to three-hadron and hadron-nucleus systems. Such studies provide a pivotal input to a better understanding of exotic nuclei and three-body dynamics,...
Precision measurements of forbidden β-decays are a crucial benchmark for Nuclear Physics calculations, which in turn play a pivotal role in Astroparticle Physics. In particular, these processes could clarify the long-standing issue of the axial coupling constant (gA) quenching in nuclear medium, which enters the theory when the hadronic current is renormalized at the nucleon level and...
Preparation works are now in progress for next-generation Lambda hypernuclear spectroscopy using the (e,e'K$^+$) reaction at Jefferson Laboratory (JLab) and the ($\pi^+$,K$^+$) reaction at J-PARC. The experiments at JLab aim to clarify the isospin dependence of Lambda hypernuclei using Ca40,48 targets and the mass number dependence from light to heavy hypernuclei such as $^{208}_\Lambda$Tl...
Next generation neutrino facilities, such as DUNE, rely on precise modelling of neutrino induced hadron knockout processes from nuclei in the detector medium (e.g Argon) to determine the initial (untagged) neutrino beam energy and determine the neutrino flux. However, uncertainty in the modelling of these nuclear interactions is currently the largest systematic uncertainty in extracting the...
I will review studies of exotic meson states in the charmonium region (the XYZ states) performed by the BESIII experiment. Recent results include new decay modes of the X(3872), new e+e- cross sections in the region of the Y(4230), and updates on studies of the isospin-one Zc and isospin-half Zcs states. I'll also preview ongoing and future efforts, which will be much enhanced by an upcoming...
Recently, a novel pentaquark picture ($Qqq\bar{q}q$) in addition to the conventional three-quark one ($Qqq$) for describing the Roper-like singly heavy baryons such as $\Lambda_c(2765)$ and $\Xi_c(2970)$ has been invented, based on a chiral model. In this talk, I review roles of chiral symmetry and the $U(1)_A$ axial anomaly for those two states, and present our prediction of the existence of...
Two-particle angular correlation is one of the most powerful tools to study the mechanism of particle production in pp collision systems by relating the difference between the azimuthal angle ($\Delta\varphi$) and the rapidity ($\Delta$y) of a pair of particles. Hadronization processes are influenced by various physical phenomena, such as resonance decays, Coulomb interactions, laws of...
We present a model for the J/ψ Λ spectrum in B− → J/ψ Λ p ̄ decays, including the PΛ_{psi s} (4338)
baryon recently observed by the LHCb collaboration. We assume production via triangle diagrams
which couple to the final state via non-perturbative interactions which are constrained by heavy-
quark and SU3-flavor symmetry. The bulk of the distribution is described by a triangle diagram
with...
The WASA-FRS hypernuclear experiment has been performed at GSI in 2022 for measuring the lifetimes of hypertriton and ${}_{\Lambda}^{4}\mathrm{H}$ and for confirming whether or not a neutral charged bound state of a $\Lambda$ hyperon and two neutrons, $nn\Lambda$, can exist. Hypernuclei of interest were produced by the induced reaction with ${}^{6}\mathrm{Li}$ and ${}^{12}\mathrm{C}$...
I will discuss the physics cases and opportunities of a future high energy Muon Collider from a Beyond the Standard Model (BSM) perspective.
I will do so by clarifying the role of precision measuements in the search for BSM physics and the role of the BSM parametrization in precision measurements, and reviewing recent studies of the performance of a high energy Muon Collider for precision...
The talk will report on the most recent results by the CMS collaboration on the ration between the $B^0_s$ and $B^+$ production ratio $f_s/f_u$.
The Born-Oppenheimer approximation for QCD provides an intuitive yet rigorous framework for the study of mesons containing two heavy quarks. The energy levels of QCD with two static color sources, numerically accessible on the lattice, are translated into potentials for the nonrelativistic motion of the heavy quarks. The mass spectrum is then determined simply by integrating a multichannel...
Heavy baryon spectroscopy is essential for us to understand the strong interaction and the inner structure of hadrons. With the increasing luminosity and the development of the techniques, more and more results on heavy baryons are reported by LHCb. In this talk, the speaker will introduce some very recent results on the conventional charm baryons from LHCb
The light meson regime still is not too well understood and holds many open questions that can only be answered using sophisticated analysis strategies to describe the data.
In particular, searching and investigating exotic states e.g. glueballs, hybrids and tetraquarks is a real challenge among the many broad and overlapping resonances, but represent a key point towards a better...
I will explain how we applied thermal effective hadron theories to extract the spectral functions of $D$ and $D^*$ mesons at finite temperature. Then, by modeling the exotic $X(3872)$ / $X(4014)$ as dynamically-generated states out of the $D$ - $\bar{D}^*$ / $D^*$ - $\bar{D}^*$ meson rescattering, I will address the thermal dependence of their masses and decay widths. When these states...
Hadron photoproduction is an essential experimental tool that gives important information on the spectroscopic and structural nature of hadrons. At large photon energies and low invariant mass of the $\pi\pi$ subsystem, the differential cross section is dominated by the prominent $\rho(770)$ resonance. At forward angles, the production of the $\rho$ is mostly diffractive, and exhibits a...
The approach to exotic hadrons with heavy quarks based on the Effective Field Theory is overviewed and its application to particular near-threshold exotic states in the spectrum of charmonium and bottomonium is discussed.
We perform a theoretical study of the D+s → π+π+π−η decay. We look first at the basic D+s decay at the quark level from external and internal emission. Then hadronize a pair or two pairs of qq¯ states to have mesons at the end. Posteriorly the pairs of mesons are allowed to undergo final state interaction, by means of which the
a0(980), f0(980), a1(1260), and b1(1235) resonances are...
In this presentation, we report on two recent results on peak-like structures observed in $\Lambda_c$ decays at Belle.
One is from $\Lambda_c \to pK^-\pi+$ decay where a peak near the $\Lambda \eta$ threshold is observed in the $pK^-$ mass spectrum. We studied the peak shape using a standard Breit-Wigner and Flatte distributions, and found the latter represents the shape by more than...
A polarized gaseous target, operated in combination with the high-energy, high-intensity LHC beams and a highly performing LHC particle detector, has the potential to open new physics frontiers and to deepen our understanding of the intricacies of the strong interaction in the non-perturbative regime of QCD. Specifically, the LHCspin project aims to perform spin physics studies in high-energy...
The production of light (anti)nuclei has been measured over the last decades in many facilities ranging from low collision energies at the AGS and GSI to high energies at RHIC and the LHC. Despite the plethora of experimental results, the production mechanism of light (anti)nuclei is still mysterious and under intense debate in the scientific community. The experimental data are typically...
The LHCb collaboration has recently reported the largest CP violation effect from a single amplitude, as well as other giant CP asymmetries in several BB-meson decays into three charmless light mesons. It is also claimed that this is predominantly due to ππ→KKˉππ→KKˉ rescattering in the final state, particularly in the 1 to 1.5 GeV region. In these analyses the ππ→KKˉππ→KKˉ amplitude is by...
We perform the first global and unitary analysis of e+e− → b ̄b cross sections. We analyze exclusive cross sections in the BB ̄, B∗B ̄(+c.c.), B∗B ̄∗, Bs∗B ̄s∗, Υ(nS)π+π− and hb(nP)π+π− channels as well as the total inclusive cross section for b ̄b production. Pole positions and residues are determined for four vector states, which we associate with the Υ(4S), Υ(10750), Υ(5S) (or Υ(10860)),...
In recent years, the bulk viscosity of a quark gluon plasma is gaining
increasing attention concerning the beam energy scan program, since the bulk viscous effect is expected to be enhanced near a critical point. Here we address the question of whether heavy quarkonia, which are produced at the early stage of the heavy ion collisions, are sensitive
to the bulk viscous nature of the quark...
We discuss the interaction between an anti-D meson and a nucleon, which has recently been studied in LHCb experiments, by considering the meson-exchange potential model. Applying the framework of the heavy-hadron effective theory respecting both chiral symmetry and heavy-quark spin symmetry, we build the potential model by the light-meson exchanging between an anti-D meson and a nucleon. In...
We study the hadronic production of $D$-wave states of $\bar bc$ quarkonium. The relative yield of such states is estimated for kinematic conditions of LHC experiments. The direct $B_c(D)$ production is complemented by NRQCD contributions being the same order $O(v^4)$. The NRQCD matrix elements are estimated within naive velocity scaling rule.
The formation mechanism of light (anti)nuclei produced in high-energy hadronic collisions is an open question that is being addressed both theoretically and experimentally. Moreover, the study of (anti)nuclei production at particle accelerators is relevant to model the flux of antinuclei produced in cosmic ray interactions, which represents the dominant background for dark matter searches. In...
We present a novel extraction of the pole position of the f0(980) from the available dispersive analyses of the $\pi\pi\to\pi\pi, \bar{K}K$ channels using an effective range expansion. Afterwards, we use a neural network as a classifier to investigate the possible nature of the state, finding that a molecular interpretation is the most likely.
This talk is based on the main results of the published article JHEP 04 (2022) 152. Model independent bounds on new physics are obtained using semi-leptonic tau decays as observables. To do this, We determine the dependence of several inclusive and exclusive τ observables on the Wilson coefficients of the low-energy effective theory describing charged-current interactions between light...
COMPASS aims at extracting the excitation spectrum of light and strange mesons in diffractive scattering. Resonances are identified through partial wave analysis, which inherently relies on analysis models. Besides statistical uncertainties, systematic effects connected to the analysis methods are a key challenge. We will discuss some sources of systematics connected to $\pi^-\pi^-\pi^+$ and...
The excitation spectrum of light mesons which are composed of up, down, and strange quarks, allows us to study QCD at low energies and is an important input to other analyses such as searches for $CP$ violation in hadronic $B$-meson decays. While the non-strange light-meson spectrum is already mapped out rather well, many predicted strange mesons have not yet been observed experimentally and...
Over the past decade, significant progress has been made in understanding (anti)(hyper)nucleosynthesis at hadronic colliders, such as the Large Hadron Collider (LHC). Research on the production of antinuclei and hypernuclei has broadened our understanding of the field, with the ALICE experiment playing a pivotal role.
As we look towards the future, new experiments and detector technologies at...
In the context of the anomalous magnetic moment of the muon, the hadronic contribution plays a crucial role, especially concerning the error budget estimation. Currently, lattice QCD simulations confront the dispersive calculations based on e+e- hadronic cross sections. The new MUonE experimental proposal pretends to shed light on that situation. Still, a powerful method to extract the desired...
We propose a phenomenological extended vector meson dominance model for the baryon electromagnetic structure, and it is found that the current experimental data on the Lambda, Sigma, and Xi electromagnetic form factors in the time-like region can be well described.
We present a study of strong parity-violating contributions that can be included in inclusive Deep Inelastic Scattering (DIS) off an unpolarized proton target. We show that a non vanishing parity-violating structure function arise even in the case of pure photon exchange, in contrast with standard results.
The size of the additional strong parity-violating term is estimated by fitting...
I would present results based on the papers: PRD 104, 114015, Arxiv 2304.01870,Arxiv 2303.06078, shared with the collaborators: A. Feijoo, W.H. Liang, I. Vidana, L.R. Dai, L. Abreu, M. Albaladejo and J. Nieves.
I would show how the Tcc appears naturally within an extension of the local Hidden gauge approach, with the correct mass and width and isospin I=0 nature. Then expose a general...
Mathematical ambiguities in partial wave analyses cause unavoidable problems in interpreting data from scattering experiments. These ambiguities appear as distinct sets of partial waves which can describe the same experimental data. In principle, these ambiguities may be resolved by leveraging knowledge about the physics of the process of interest, or by enforcing additional constraints. We...
Evidence for electroweak-scale Dark Matter (DM) particles arising from direct searches has proven to be extremely elusive so far. However, the existence of light (sub-GeV) particles could also be investigated searching for rare events at accelerators. A simple possibility for light DM is that its constituents belong to some Hidden Sector, uncharged under the Standard Model (SM) forces and...
The unpolarized twist-2 (leading) and twist-3 (subleading), T-even,
transverse-momentum dependent quark distributions in the pion are
evaluated for the first time by using the actual solution of a
dynamical equation in Minkowski space. The adopted theoretical framework
is based on the homogeneous Bethe-Salpeter integral equation with
an interaction kernel given by a ladder...
Precise measurements of $\Lambda$ hypernuclear binding energies are essential in understanding the interaction between $\Lambda$ and nucleons. Thanks to the recent progress of accurate theoretical calculations and cutting-edge experiments for $\Lambda$ hypernuclei around the light mass regions, the studies of the interaction of the hypernuclear medium have progressed well; for example, the...
We present a recursive quantum mechanical model for the polarized fragmentation process of a string stretched between a quark and an antiquark with entangled spin states. The quarks are assumed to be produced in the $e^+e^-$ annihilation process and are described by a joint spin density matrix that implements the correlations between their spin states. The string fragmentation process is...
The recent experimental observation of the first doubly charm exotic state Tcc(3875)+ by the LHCb collaboration has triggered the enormous interest in the community. Indeed, this state has very peculiar properties, since it is located just a few hundreds keV below the $D^0D^{*+}$ threshold and its width stems almost entirely from the only available strong decay channel $DD\pi$, as a...
The anomaly observed in the opening angle and invariant mass distributions of e$^+$e$^−$ pairs produced in the decays of excited $^8$Be, $^4$He and $^{12}$C nuclei [1-3] can be interpreted with the creation and subsequent decay of a particle of mass approximately 17 MeV which has been named X17.
Along the years, several light particles have been postulated by theoretical extensions of the...
In the quest of understanding the nature of neutron stars, the study of the nuclear equation of state (EoS) plays a pivotal role. For constraining the latter, a comprehensive knowledge of the strong interaction among hadrons is crucial. However, probing these interactions in scattering experiments is challenging for strange baryons due to the unstable nature of hyperon beams and thus the...
I present preliminary results of a partial-wave analysis of $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ in data from the Belle experiment at the KEK $\mathrm{e}^+\mathrm{e}^-$ collider. I demonstrate the presence of the $\mathrm{a}_1(1420)$ and $\mathrm{a}_1(1640)$ resonances in $\tau$ decay and measure their parameters. I also present validation of our findings using a model-independent approach. ...
The hypertriton is the lightest known hypernucleus composed of a proton, a neutron, and a Λ hyperon. This extremely loosely bound system has a radial extension of its wave function of about 10 fm. Measurements of its lifetime and binding energy provide information on the hadronic interaction between hyperons and nucleons which is complementary to that obtained from correlation measurements....
New models for photoproduction of kaons on the proton were constructed [1] utilizing new experimental data from LEPS, GRAAL, and particularly CLAS collaborations. The higher spin nucleon (spin-3/2 and spin-5/2) and hyperon (spin-3/2) resonances were included using a consistent formalism and they were found to play an important role in the data description. In order to account for the unitarity...
The $a_1(1260)$ is cleanly observed in $\tau$ decays and can therefore serve as a testbed for resonant three-body physics. The first calculation of a three-body resonance from lattice QCD and its mapping to the infinite volume is presented. In addition, the resulting three-body unitary amplitude is continued to complex energies allowing for the extraction of the $a_1$ pole and its branching...
The Electron Ion Collider (EIC) is a next-generation hadron physics facility, planned to be built in the coming decade at Brookhaven National Laboratory (BNL), with the intention of further exploring the quark and gluon substructure of hadrons and nuclei. The EIC will address fundamental questions in QCD, probing the interplay of quarks and gluons to learn how they contribute to overall...
Systems like $\overline{\rm K}$N and baryon–antibaryon (B$\overline{\rm B}$) are both characterized by the presence of strong inelastic channels at the production threshold, which can affect the properties and the formation of bound states and resonances. The K$^-$p interaction is characterized by the presence of several coupled channels, systems with a similar mass and the same quantum...
The AdS/QCD correspondence allows to compute the quark-antiquark potential. We use this result, the Salpeter equation and a hyperfine splitting potential to determine masses of tetraquarks and pentaquarks containing at least two heavy quarks, based on the hypothesis of a diquark-antidiquark and antiquark-diquark-diquark structure.
One of the present challenges for the theoretical understanding of heavy-quark hadronization is represented by the description of the measurements of heavy baryon production in $pp$, $pA$ and $AA$ collisions. The $\Lambda_c/D^0$ ratio observed in $AA$ collisions has a value of the order of the unity, and experimental measurements in $pp$ collisions at both $\sqrt{s}=5.02 \,\rm TeV$ and...
J/ψ near threshold photoproduction plays a key role in the physics program at the Thomas Jefferson National Accelerator Facility (JLab) 12 GeV upgrade due to the wealth of information it has to offer. J/ψ photoproduction proceeds through the exchange of gluons in the t-channel and is expected to provide unique insight about the nucleon gluonic form factors and the nucleon mass radius.
The...
The data published by the Particle Data Group (PDG) in the Review of Particle Physics has traditionally been made available to the HEP community and beyond as a biennial publication in a scientific journal, in print as the PDG Book and the Particle Physics Booklet, and more recently primarily via the PDG website and the interactive pdgLive web application. Except for a number of data files...
An experimental program has been approved at the Thomas Jefferson National Accelerator Facility to measure the (ep,e’K+)Y reactions using the CLAS12 setup in Hall B.
Data have been obtained using electron beams with energies of 6.5, 7.5, and 10.2 GeV, impinging upon a liquid hydrogen target in the CLAS12 center. Scattered electrons have been detected in a polar angle range of 2.5° to 4.5° by...
The world’s largest samples of $J/\psi$ and $\psi(3686)$ events produced in $e^+e^-$ annihilation provide a clean source of baryon excitations, allowing for a rich baryon spectroscopy programme at BESIII. Based on the large data samples collected by BESIII experiment, the baryon spectroscopy has been studied through decays J/psi -> omega p anti-p, psi(3686) -> Lambda anti-Lambda eta, psi(3686)...
The future of high energy physics relies on the capability of exploring a broader energy range than current accelerators, with higher statistics. A muon collider combines the great precision of electron-positron machines, with a low level of beamstrahlung and synchrotron radiation, and the high center-of-mass energy and luminosity of hadron colliders.
For these reasons, studies aimed at...
The existence of pentaquarks with strangeness content zero and one are major discoveries of the latest years in hadron physics. Most of these states can be understood as hadronic molecules and were predicted prior to their discovery within a model based on unitarized meson-baryon amplitudes obtained from vector meson exchange interactions. Contrary to earlier statements, we show this model to...
Machine learning techniques have become very powerful and practical tools not only in our daily life but also in scientific research. We have performed several developments of machine learning models to study light hypernuclei, especially hypertriton, $^4_{\Lambda }$H and an nn$\Lambda $ state. We have developed a complex of analysis methods for analyzing the J-PARC E07 nuclear emulsion data...
The chiral anomaly is a fundamental property of quantum chromodynamics (QCD). It governs e.g. the decay of the neutral pion $\pi^0\to\gamma\gamma$. In general, it relates the coupling of an odd number of Goldstone bosons to vector bosons. In case of three pions, the magnitude of the resulting coupling is $F_{3\pi}$ and the value is precisely predicted by chiral perturbation theory. It can...
A densely connected feed-forward neural network is capable to classify poles of scattering matrix if fed with experimentally measured values of energy-dependent production intensity. As shown in [1], such a neural network trained with synthetic differential intensities calculated with scattering length approximated amplitudes classifies the $P_c$(4312) signal as a virtual state located at the...
Heavy quarks, namely charm and beauty, are very suitable probes of the colour-deconfined state of the hadronic matter called quark-gluon plasma (QGP) created in heavy-ion collisions. Since they are mainly produced in hard-scattering processes and hence in shorter timescales compared to the lifetime of the QGP, they experience the whole evolution of the system. Measurements of heavy-flavour...
The new Facility for Antiproton and Ion Research (FAIR) is under construction at GSI in Darmstadt (Germany). Antiprotons are planned to be provided by the High Energy Storage Ring, at which the PANDA experiment will directy be located. It represents the central part of the hadron physics programme. The field of hadron spectroscopy has gained new momentum by the discovery of the so-called...
We propose a new way of studying the spin content of a hadron by looking at its response in a rotating frame. By collecting all responses of quarks and gluons in a rotating frame, we describe the spin-rotation coupling of spin-1 quarkonia and thereby reveal their spin contents in a fully relativistic way. We demonstrate that both the perturbative and non-perturbative contributions in the...
The ePIC detector is being designed as a general-purpose detector for the Electron-Ion Collider (EIC) to deliver the full physics program. One of the key challenges at the EIC is particle identification (PID), which requires excellent separation of pions, kaons, and protons over a wide phase space with significant pion/electron suppression. To address this challenge, ePIC utilises multiple...
Recent LHCb's amplitude analysis on $B^+\to J/\psi \phi K^+$ suggests the existence of exotic $X$ and $Z_{cs}$ hadrons, based on an assumption that Breit-Wigner resonances describe all the peak structures. However, all the peaks and also dips in the spectra are located at relevant meson-meson thresholds where threshold kinematical cusps might cause such structures. This points to the...
We investigate the possibility to determine the value of the pion–nucleon sigma term precisely by the experimental observables of the deeply bound pionic atoms. We discuss the sensitivity of the observables of the deeply bound pionic atoms to the value of the sigma term. We find that the gap of the binding energies and the width of the deeply bound pionic states are good quantities for the...
Hadron mass spectra have been a topic of investigation since long so as to explore the unknown degrees of freedom of quarks inside a composite system. The non-relativistic approach backed by constituent quark model alongwith hypercentral potential term has been used to obtain a number of excited resonance masses for light, strange baryons. The $\Xi$ and $\Omega$ baryons are known with very...
From unitarized chiral perturbation theory analyses, the structure of $D^*_0(2300)$ and $D_1(2430)$ can be understood as the interplay of two poles, corresponding to two scalar/axial-vector isospin doublet states with different SU(3) flavor content. These states emerge from non-perturbative dynamics of $D$ mesons scattering off the Goldstone boson octet. This two pole picture solves various...
The ePIC general purpose detector for the Electron-Ion Collider (EIC) will be constructed at the Brookhaven National Laboratory in the US by 2030. It will provide an almost hermetic coverage in tracking, electromagnetic and hadronic calorimetry, as well as particle identification (PID) in the pseudorapidity range between -3.5 and +3.5. In particular, the ePIC backward endcap will be equipped...
The production cross section of charm hadrons in hadronic collisions can be calculated using the factorisation approach as a convolution of three factors: the parton distribution functions (PDFs), the hard-scattering cross section at the partonic level, and the fragmentation functions of the produced heavy quarks into given species of heavy-flavour hadrons, which is assumed to be universal for...
The GlueX experiment at Jefferson Lab was specifically designed for precision studies of the light-meson spectrum. For this purpose, a photon beam with energies up to 12$\,$GeV is directed onto a liquid hydrogen target contained within a hermetic detector with near-complete neutral and charged particle coverage. Linear polarization of the photon beam with a maximum around 9$\,$GeV provides...
We discuss the modification of the properties of the tetraquark-like $T_{cc}^+(3875)$ in dense nuclear matter. We consider the $T_{cc}^+$ in vacuum as a purely molecular isoscalar ($D^0D^{*+}/D^+D^{*0}$) bound state in $S-$wave, generated from a heavy-quark symmetry leading-order interaction between the charmed mesons. We compute the $D$ and $D^*$ spectral functions embeded in a nuclear...
I will tell the story (or part of it) of rare B decays of the last ~10 years.
Belle II offers unique possibilities for discovering and interpreting exotic multiquark bound states to probe the fundamentals of QCD. This talk presents recent results on a unique data set collected at energies above the $\Upsilon$(4S), including searches for the hidden bottom transition between Y(10750) and $\chi_{bJ}$ and measurements of the energy dependence of the $e^+e^- \to B^{(*)} \bar...
What can we learn about the internal structure of hadrons from the matrix elements of the electromagnetic current and the energy-momentum tensor?
To give an answer we parametrize these matrix elements in terms of form factors and briefly discuss how the form factors are connected with experimentally measurable quantities, in particular the gravitational form factors with the generalized...
In-medium mass of the light vector mesons $\rho$, $\omega$ with $J^{PC}=1^{--}$, and the parity partner of $\rho$, the axial-vector $A_1$ meson with $J^{PC}=1^{++}$, are studied in the nuclear matter in presence of an external magnetic field, accounting for the effects of (inverse) magnetic catalysis. The in-medium partial decay widths of the possible $A_1\rightarrow \rho \pi$ decay modes are...
In this talk, I will introduce an alternative method of derivative expansion to extract the hadron-hadron potential from Nambu-Bethe-Salpeter (NBS) wave functions that is more efficient in handling large nonlocality. While the HALQCD method has become popular for obtaining hadron interactions from lattice QCD simulations, its derivative expansion has been criticized for its unclear systemic...
Although the charmonium spectrum seems well investigated, charmonia can still be used as benchmarks to test our QCD predictions, as these states lay in the transition region between perturbative and non-perturbative QCD. Despite the need for experimental confirmations, setbacks arise from limited statistics due to the production of non-vector states. Some charmonium states' properties and...
The in-medium masses of the pseudoscalar $(D,{\bar D}, D_s^{\pm})$, and vector $(D^*,\bar{D}^*, D_s^{*\pm})$, open charm mesons are studied in isospin asymmetric magnetized nuclear matter, accounting for the effects of the magnetized Dirac sea. The in-medium masses of the open charm mesons are calculated from their interactions with the nucleons and scalar mesons within the generalized chiral...
Renormalizability of an effective field theory allows one
to perform a systematic expansion of the calculated observable
quantities in terms of some small parameter in accordance with
a certain power counting.
We consider chiral effective field theory in application to the
nucleon-nucleon interaction
at next-to-leading order in the chiral expansion.
The analysis of the...
We benefit from the lattice QCD determination of the Standard Model (SM) form factors for the $\bar B_s\to D_s^{*}$ and $\bar B_s\to D_s$ semileptonic decays carried out by the HPQCD collaboration in Refs. Phys. Rev. D 105, 094506 (2022) and Phys. Rev. D 101, 074513 (2020), and the heavy quark effective theory (HQET) relations for the analogous $B\to D^{(*)}$ decays obtained by F.U....
In this contribution we discuss and present the holographic graviton soft-wall model
(GSW) description of the meson and glueball spectra. This model relies on a semi-classic
approximation of non perturbative QCD. We summarize the main results of Ref. [1]
where the scalar and tensor components of the glueball spectrum have been calculated.
In particular, we proposed to consider a graviton,...
The LHCb experiment has collected a unique sample of data from high-energy proton proton collisions, that enables a range of studies of heavy meson spectroscopy. As well as high-profile results on exotic states, many of which are covered in other talks, these studies also provide crucial information about conventional mesons. Latest results on charmonia, charm, and beauty mesons are...
The last few years have seen the observation of a series of hidden-charm pentaquarks by the LHCb collaboration. The most recent one is the $P_{\psi s}^{\Lambda}(4338)$, which has the quantum numbers of a $\Lambda$ baryon. Most of these pentaquarks are close to a meson-baryon threshold and have been readily interpreted as bound (or molecular) states. Here we explore what are the consequences of...
We investigate the mass modifications of open strange mesons (vector $K^*$ and axial vector $K_1$) in (magnetized) isospin asymmetric nuclear matter using Quantum Chromodynamics sum rule (QCDSR) approach. The in-medium decay widths of $K^*$ $\rightarrow$ $K\pi$ and $K_1$ $\rightarrow$ $K^*\pi$ are studied from the mass modifications of $K_1$, $K^*$ and $K$ mesons, using a light quark-antiquark...
Time-Like Compton Scattering (TCS) is a hard, exclusive scattering process, in which a real photon scatters from a target nucleon, producing a virtual
(timelike) photon, which couples to a lepton pair in the final state [1].
TCS, via cross section and asymmetry observables, gives access to Gener-
alised Parton Distributions (GPDs), through which we can develop a tomo-
graphic mapping of...
The BESIII experiment has collected 2.6B psi(2S) events and 10B J/psi events. The huge data sample provide an excellent chance to search for rare processes in charmonium decays. In this talk, we report the recent search for J/psi->D^-e+nu_e, psi(2S)->Lambda_c anti-Sigma^-. The big charmonium sample also produce millions of hyperons, which is used to study the weak decay of \Sigma^-...
We present a lattice QCD calculation of the electromagnetic form factor of the pion in the timelike region.
This calculation was performed on a lattice with N=2+1 dynamical quark flavors, with a heavier than physical pion mass of 284 MeV.
At this pion mass, the rho meson main contribution to pion-pion scattering and the timelike form factor appears in the elastic energy region.
The...
Photocouplings of pentaquarks are crucial ingredients for photoproduction experiments at JLab which aim to confirm the existence of the hidden-charm pentaquarks reported by the LHCb Collaboration using electromagnetic probes. Photocouplings of ground- and excited-state hidden-charm pentaquarks are analyzed in a quark model approach in which we distinguish between light ($u$, $d$ and $s$) and...
Neutrinoless double-beta decay (0nbb) is a beyond standard model atomic decay which involves atomic, nuclear and particle physics. Since these different fronts naturally involve separated energy scales, effective field theory (EFT) provides a natural framework to study this process.
In this talk I will present some EFT ideas to study 0nbb. In particular, I will focus on EFTs for the...
Analysis of vector and axial vector meson systems will give insight into the light quark meson spectrum. Vector-pseudoscalar final states provide access to a rich set of intermediate states, including those mentioned above, but their analysis is complicated by the non-zero spin of the vector meson. A resonance amplitude model in the reflectivity basis is used to perform a partial wave analysis...
Accurate modelling of the b-jet fragmentation is important for measurements at the LHC where b-jets identification is required to isolate signal or reject backgrounds. In this talk, we present the measurement of b-quark fragmentation properties into jets using the decay of B hadrons to J/Psi and Kaon in pp collisions at the centre-of-mass energy of 13 TeV. In addition, charged-particle...
Proton spin crisis was initiated by the EMC (CERN, SPS) collaboration measurement in late 80’s which says proton spin carried by quarks far smaller than 100%. Where is the rest coming from? Yes, from gluon contribution and orbital momenta, but details still to be understood. Today, the next biggest science question is: why proton is so heavy and pion is so light? The origin of hadron masses is...
to be added
The search for neutrinoless double beta (0$\nu\beta\beta$) decay is considered as the most promising way to prove the Majorana nature of neutrinos as well as to give an indication on the mass hierarchy and on the absolute mass scale. The discovery of 0$\nu\beta\beta$ decay would moreover open the way for theories predicting the observed matter anti-matter asymmetry of the Universe being a...
Effective chiral Lagrangian of deltas, nucleons and pions in external gravitational field and the corresponding energy-momentum tensor will be considered. The gravitational form factors together with the spatial local density distributions of the deltas will be discussed.
At the large distances compared to the chiral symmetry breaking scale, a four quark state $\bar Q \bar Q q q$, where $Q$ ($q$) is the heavy (light) quark, can be approximated by two asymptotic $\bar Q q$ mesons and one can analyze the meson-meson potentials to explore the long-range strong force in such systems. To this end, we study the potential between two bottom mesons in the heavy quark...
The NA62 experiment at CERN took data in 2016–2018 with the main goal of measuring the $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay. The NA62 dataset is also exploited to search for light feebly interacting particles produced in kaon decays. Searches for $K^+\rightarrow e^+ N$, $K^+ \rightarrow \mu^+ N$ and $K^+ \rightarrow \mu^+ \nu X$ decays, where N and X are massive invisible particles, are...
