QCD@Work - International Workshop on QCD - Theory and Experiment

27 Jun 2022, 08:00 → 30 Jun 2022, 19:00 Europe/Rome

Auditorium (Auditorium del Museo Provinciale "Sigismondo Castromediano" - Lecce (Italy))

LOCANDINA FISICA-small-1.jpg

privacy.pdf

Monday, 27 June ¶

08:45 → 09:15 Registration¶

09:15 → 09:30 Welcome¶

09:30 → 10:50 Session 1¶

Convener: Giuseppe Eugenio Bruno (Istituto Nazionale di Fisica Nucleare)

09:30 Neutron star mergers as materials science¶

Speaker: Mark Alford (Washington University in St. Louis)

Alford.pdf

10:00 A journey through experimental highlights on heavy-ion physics¶

Speaker: Alberto Calivà (University of Salerno)

highlights_heavy_ion_physics_AlbertoCaliva.pdf

10:30 Topology role in the feasibility of a neutron star’s matter phase candidate¶

One central question in nuclear astrophysics is determining the matter structure of neutron stars (NS). With the wealth of newly available and upcoming astrophysical observations, it is of most relevance to find ways to connect the microscopic properties of potential NS matter phase candidates with the observations. To understand the complicated evolution of NS binary (NSB) mergers, we will need even better simulations and a deeper fundamental understanding of the properties of hot and dense matter at very strong magnetic fields. In this talk, I will make a case for a dense quark matter phase in a strong magnetic field as a plausible candidate for the core of old magnetars and potentially also for the short-lived, superdense, and highly magnetized neutron stars that may form after the merging of NSB. I will discuss how the capacity of this phase to overcome a few astrophysical tests can be traced back to the characteristic nontrivial topology of the phase’s quark dynamics in a strong magnetic field.

Speaker: Vivian de la Incera (University of Texas Rio Grande Valley)

Incera-QCDatWork.pdf

10:50 → 11:20 Coffe break

11:20 → 13:00 Session 2¶

Convener: Fulvia De Fazio (Istituto Nazionale di Fisica Nucleare)

11:20 The high-energy limit of perturbative QCD: theory and phenomenology¶

Speaker: Alessandro Papa (Istituto Nazionale di Fisica Nucleare)

lecce.pdf

11:50 Measuring QCD in its extremes at ATLAS¶

Speaker: Ynyr Harris (Oxford University)

220625_yharris_qcd@work.pdf

12:20 QCD factorization amplitudes from SU(3) symmetries¶

A well known technique to determine the decay amplitudes of non-leptonic B meson processes is QCD factorization. One of the main issues faced by this procedure is the analytical determination of power suppressed terms, for instance of annihilation topologies. In this talk we describe the extraction of the annihilation contributions from data. Our method is based on establishing a set of rules which allow to transform the SU(3)-invariant description of B decay amplitudes into pairs of psudoscalar particles and the QCD factorization decomposition. Our approach provides not only the size of this contributions from phenomenological considerations but also a formal proof of the maximal number of degrees of freedom in the SU(3)-invariant, the topological and the QCD-factorization representations of B decay amplitudes into Pseudoscalar particles.

Speaker: Gilberto Tetlalmatzi-Xolocotzi (Nikhef)

QCDF_SU3_Italy.pdf

12:40 Modified TMD Factorization and Sub-leading Power Corrections¶

Factorization theorems are known to be extremely powerful tools in high-energy particle physics. Processes like SIDIS, Drell-Yan vector-boson production, Higgs-boson production through gluon fusion and $e^{+}{e}^{-}$ to jets and/or hadrons are just some examples of processes that have been thoroughly investigated by applying rigorous factorization formulae. Furthermore, if in these processes the transverse momentum ${\mathbf{\text{q}}}_T$ of the vector boson or final-state hadrons is measured, in the limit of small ${\mathbf{\text{q}}}_T$, leading-power transverse-momentum-dependent (TMD) factorization is an established tool to obtain further insight into the internal structure of hadrons (like spin and helicity distributions, sea quark contributions) and/or jets involved. However, in order to properly exploit increasingly precise experimental data, it is important to investigate sub-leading contributions. In this talk, we present a novel method to compute next-to-leading-power and next-to-next-leading-power contributions to TMD cross sections. In the specific example of a Drell-Yan process, we show how our analytic results allow us to achieve next-to-next-to-leading logarithmic (NNLL) resummation, recover both the leading-power TMD factorization and collinear factorization expressions up to next-to-next-to-leading order in the small ${\mathbf{\text{q}}}_T$ limit and provide a description of the cross section valid also at intermediate ${\mathbf{\text{q}}}_T$. The implications for the phenomenological extraction of TMDPDFs are also discussed.

Speaker: Sergio Leal Gómez (Universität Wien)

QCDatWORK_2022.pdf

13:00 → 15:00 Lunch break

15:00 → 16:20 Session 3¶

Convener: Claudio Coriano' (LE)

15:00 Phase diagram of QCD in strong magnetic background field¶

We discuss the phase diagram of QCD in the presence of a strong magnetic background field, providing numerical evidence, based on lattice simulations of QCD with $2+1$ flavors and physical quark masses, that the QCD crossover turns into a first order phase transition for large enough magnetic field, with a critical endpoint located between $eB=4$ GeV${}^2$ (where we found an analytic crossover at a pseudo-critical temperature $T_c=(98\pm 3)$ MeV) and $eB=9$ GeV${}^2$ (where the measured critical temperature is $T_c=(63\pm 5)$ MeV).

Speaker: Lorenzo Maio (Istituto Nazionale di Fisica Nucleare)

Lorenzo_Maio_slides.pdf

15:20 Electromagnetism in Quark Matter at Intermediate Densities¶

In this talk, I will discuss several anomalous electromagnetic effects that can take place in quark matter at low temperatures and intermediate densities. The anomalous transport properties of the spatially inhomogeneous phase of quark matter known as the Magnetic Dual Chiral Density Wave (MDCDW) phase will be reviewed. Going beyond mean-field approximation, I will show how linearly polarized electromagnetic waves that penetrate the MDCDW medium mix with the phonon fluctuations to give rise to two hybridized modes of propagation called axion polaritons. Finally, using these results, a mechanism for the possible collapse of neutron stars under the bombardment of gamma-ray bursts will be presented. This mechanism can provide a possible solution to the missing pulsar problem in the galactic center.

Speaker: Efrain J Ferrer

Efrain-QCD@Work-Final.pdf

15:40 Electromagnetic conductivity of quark-gluon plasma at finite baryon chemical potential¶

In this talk we present our study of the electromagnetic conductivity in dense quark-gluon plasma obtained within lattice simulations with $N_f$ = 2 + 1 dynamical quarks. We employ stout improved rooted staggered quarks at the physical point and the tree-level Symanzik improved gauge action. The simulations are performed at imaginary chemical potential. To reconstruct electromagnetic conductivity from current-current correlators, we employ the Tikhonov regularisation method as well as the modified Backus-Gilbert method, computing the convolution of the spectral density with the target function. Our study indicates that electromagnetic conductivity of quark-gluon plasma rapidly grows with the real baryon density.

Speaker: Manuel Naviglio (Istituto Nazionale di Fisica Nucleare)

Presentazione.pdf

16:00 Realistic neutron stars from holography¶

In this talk I will discuss the application of the Witten-Sakai-Sugimoto model for holographic QCD to neutron star matter. I will begin with a brief review of the important features of the model, including the recent theoretical advances provided by Kovensky and Schmitt in allowing for isospin asymmetric homogeneous baryonic matter. I will then describe how this can be used to construct the neutron star equation of state entirely from holography, including a dynamical computation of the crust-core transition. Finally, I will show that despite our version of the model containing only three free parameters, it is able to account for stars which simultaneously meet the current astrophysical constraints on mass, radius and tidal deformability. This talk is based on work in collaboration with Andreas Schmitt and Nicolas Kovensky.

Speaker: Aaron Poole (University of Southampton)

QCD@Work_AP.pdf

16:20 → 16:50 Coffee break

16:50 → 18:00 Session 4¶

Convener: Donato Maria Creanza (Istituto Nazionale di Fisica Nucleare)

16:50 Chiral anomaly induced charged pion superconductivity¶

Determining the phase structure of nuclear and quark matter in external magnetic fields is not only of theoretical interest but also experimentally motivated by the large magnetic fields found in heavy-ion collisions and compact star physics. In Chiral Perturbation Theory, neutral pions form an inhomogeneous phase dubbed the "Chiral Soliton Lattice" (CSL) above a certain critical magnetic field as a consequence of the chiral anomaly. Above a second, even higher critical field, the CSL becomes unstable to fluctuations of charged pions, implying they condense.

I will point out the similarity of this second critical field to the upper critical magnetic field in conventional type-II superconductors, leading to the possibility of an inhomogeneous, superconducting charged pion phase existing above this point. Applying similar methods originally used by Abrikosov, I will present results where we've constructed such a phase in the chiral limit, demonstrating that it is preferred and forms a hexagonal array of vortices. Its local effect on the baryon number density, which is non-zero and periodic like in the CSL will also be briefly discussed.

Speaker: Geraint Evans

Chiral_anomaly_induced_charged_pion_superconductivity_Conference_Talk_2022.pdf

17:10 EIC as the next QCD collider¶

Speaker: Domenico Elia (Istituto Nazionale di Fisica Nucleare)

D. Elia - EIC QCD@WORK 27.6.2022 V3.pdf

18:30 → 20:30 Guided tour in Lecce old town¶

Tuesday, 28 June ¶

09:00 → 10:40 Session 5¶

Convener: Rosa Anna Fini (Istituto Nazionale di Fisica Nucleare)

09:00 Exclusive semileptonic B meson decays using lattice QCD and unitarity¶

Speaker: Silvano Simula (Istituto Nazionale di Fisica Nucleare)

Lecce_Simula.pdf

09:30 QCD program at Belle II¶

Speaker: Anselm Vossen (Indiana University)

QCDAtWorkVossenv2.pdf

QCDAtWorkVossenv2.pptx

10:00 Nonfactorizable charming loops in exclusive rare FCNC B decays¶

Speaker: Dmitri Melikhov (University of Heidelberg)

m.pdf

10:20 Estimating one-loop radiative corrections in tau -> pi (K) nu [gamma] and testing new physics¶

Without a doubt the ratios $R_{\tau /P}\equiv \mathrm{\Gamma }(\tau \to P{\nu }_{\tau }[\gamma ])/\mathrm{\Gamma }(P\to \mu {\nu }_{\mu }[\gamma ])$ ($P=\pi ,K$) give a convenient scenario to test the lepton universality, the CKM unitarity and to search for non-standard interactions in $\tau$ decays. Moreover, the previous theoretical estimation of these observables are more than twenty-five years old and some assumptions of that estimation are unrealistic. Therefore, an update of $R_{\tau /P}$ was timely. The one-loop radiative corrections have been computed by considering an expansion of Chiral Perturbation Theory including the lightest spin-one resonances and respecting the short-distance behavior dictated by QCD. We have reported $\delta R_{\tau /\pi }=(0.18\pm 0.57)\mathrm{\%}$ and $\delta R_{\tau /K}=(0.97\pm 0.58)\mathrm{\%}$, where the uncertainties have been induced fundamentally by the estimation of the counterterms. We have tested the lepton universality, the CKM unitarity and have searched for new physics in $\tau$ decays. As a by-product, we have also determined the theoretical radiative corrections to the $\tau \to P{\nu }_{\tau }[\gamma ]$ decay rates, ${\delta }_{\tau \pi }=-(0.24\pm 0.56)\mathrm{\%}$ and ${\delta }_{\tau K}=-(0.15\pm 0.57)\mathrm{\%}$.

Speaker: Ignasi Rosell (Universidad CEU Cardenal Herrera)

rosell_QCDatwork2022.pdf

10:40 → 11:10 Coffee break

11:10 → 12:30 Session 6¶

Convener: Gabriele Chiodini (Istituto Nazionale di Fisica Nucleare)

11:10 3D nucleon structure: where we stand, where we'll be heading to¶

Speaker: Mariaelena Boglione (Istituto Nazionale di Fisica Nucleare)

Boglione_QCD@work_2022.pdf

11:40 Hard exclusive meson production in muon scattering at COMPASS¶

Speaker: Andrzej Sandacz (National Centre for Nuclear Research, Warsaw)

sandacz-QCD@Work-2022.pdf

sandacz-QCD@Work-2022.ppt

12:00 Recent LHCb results for heavy ions¶

Speaker: Giacomo Graziani (Istituto Nazionale di Fisica Nucleare)

graziani_QCDatWork.pdf

12:30 → 15:00 Lunch break

15:00 → 16:00 Session 7¶

Convener: Donato Maria Creanza (Istituto Nazionale di Fisica Nucleare)

15:00 Constraining heavy-flavour PDFs at hadron colliders¶

Speaker: Marco Guzzi (Kennesaw State University)

qcd@work22-mguzzi.pdf

15:20 Charming hadronization measurements with the ALICE experiment¶

Speaker: Marco Giacalone (Istituto Nazionale di Fisica Nucleare)

QCD@Work.pdf

15:40 High pT results and parton density functions from ATLAS¶

Speaker: Javier Llorente Merino

llorenteQCD.pdf

16:00 → 16:30 Coffee break

16:30 → 17:50 Session 8¶

Convener: Luigi Delle Rose (Istituto Nazionale di Fisica Nucleare)

16:30 From PT Quantum Mechanics to PT Holography¶

Speaker: Karl Landsteiner (Instituto de Fisica Teorica CSIC/UAM)

PT_Holo_Lecce22.pdf

16:55 Nonperturbative renormalization in large-N QCD and topological strings¶

Speaker: Marco Bochicchio (Istituto Nazionale di Fisica Nucleare)

BochicchioQCD@work.pdf

17:20 From dS to AdS and back¶

Speaker: Massimo Taronna (Istituto Nazionale di Fisica Nucleare)

dS to AdS - Lecce.pdf

Wednesday, 29 June ¶

09:00 → 10:50 Session 9¶

Convener: Claudio Coriano' (LE)

09:00 High precision measurement of the W boson mass with the CDF II detector¶

Speaker: Chris Hays (University of Oxford (GB))

Lecce.key

Lecce.pdf

09:30 NNLO accurate QCD predictions for the LHC¶

Speaker: Massimiliano Grazzini (Istituto Nazionale di Fisica Nucleare)

Grazzini_QCD@Work22.pdf

10:00 The PDF4LHC21 combination of global PDF fits for the LHC Run III¶

Speaker: Emanuele Roberto Nocera (Higgs Centre for Theoretical Physics, School of Physics and Astronomy, University of Edinburgh)

NOCERA_QCDATWORK_APPENDIX.pdf

10:20 CMS experimental results¶

Speaker: Qun Wang (DESY)

QCDworkQun.pdf

10:50 → 11:20 Coffee break

11:20 → 13:00 Session 10¶

Convener: Eugenio Nappi (Istituto Nazionale di Fisica Nucleare)

11:20 Overview of most recent BES III results¶

Speaker: Marco Scodeggio (Istituto Nazionale di Fisica Nucleare)

QCD@Work_MS_290622.pdf

11:50 Exotic states¶

Speaker: Elena Santopinto (Istituto Nazionale di Fisica Nucleare)

SANTOPINTOftot.pdf

12:20 Impact of clustering inside compact tetraquarks¶

Speaker: Hagop Sazdjian (Université Paris-Saclay, IJCLab)

sazdjian-wqcd22.pdf

12:40 Weak decays of the double-beauty tetraquark¶

Speaker: Birten Barsbay

QCD@Work2022.BirtenBarsbay.pdf

total 30 min (20+10)

13:00 → 15:00 Lunch break

15:00 → 16:00 Posters: poster session + coffee¶

15:00 Asymptotic symmetries, soft theorems and memory effects in gravity¶

Over the last few years a triangular equivalence relation was discovered connecting three apparently different topics: asymptotic symmetries, soft theorems and memory effects. This equivalence relation can be drawn potentially in every theory with a massless particle, for example in QED, QCD, SUSY, gravity and string theory.
I will review the triangular equivalence in the context of gravity and I will examine its generalization in arbitrary even dimensions. I will focus in particular on the connection between the subleading soft graviton theorem and asymptotic symmetries.

Speaker: Stefano Lionetti (Istituto Nazionale di Fisica Nucleare)

poster.pdf

15:01 Study of n = 2 D-wave charm mesons¶

By exploring Heavy Quark Effective theory, We predicted masses and decay widths for n=2 D-wave charm mesons. We use available data for bottom mesons and apply heavy quark symmetry to predict masses and decay widths in terms of coupling constants. These predictions may helpful in upcoming experiments at LHCb BESIII, PANDA to look into these states.

15:02 Scale Invariance, Renormalization, and the Naturalness/Hierarchy problem¶

In the search for physics beyond the Standard Model, in recent years interest has grown towards models with classical scale invariance. When the radiative corrections are calculated within the framework of dimensional regularization, the scale invariance at the quantum level is only logarithmically broken. The (small) values of the particle masses are then generated through a Coleman-Weinberg mechanism, and no naturalness/hierarchy problem seems to be present. Based on novel studies on renormalization, in this talk I will present a thorough analysis of the problem, with particular attention to dimensional regularization. More specifically, I will investigate on the possibility of applying recently proposed peculiar renormalization schemes, that seem to be necessary to implement some popular models.

Speaker: Filippo Contino

15:03 Machine Learning model driven prediction of the initial geometry in Heavy-Ion Collision experiments¶

We demonstrate high prediction accuracy of three important properties that determine the initial geometry of the heavy-ion collision (HIC) experiments by using supervised Machine Learning
(ML) methods. These properties are the impact parameter, the eccentricity, and the participant
eccentricity. Though ML techniques have been used previously to determine the impact parameter
of these collisions, we study multiple ML algorithms, their error spectrum, and sampling meth-
ods using exhaustive parameter scans and ablation studies to determine a combination of efficient
algorithm and tuned training set that gives multi-fold improvement in accuracy for all three differ-
ent heavy-ion collision models. The three models chosen are a transport model, a hydrodynamic
model, and a hybrid model. The motivation for using three different heavy-ion collision models
was to show that even if the model is trained using a transport model, it gives accurate results
for a hydrodynamic model as well as a hybrid model. We show that the accuracy of the impact
parameter prediction depends on the centrality of the collision. With the standard application of
ML training methods, prediction accuracy is considerably low for central collisions. Our method
increases this accuracy by multiple folds. We also show that the eccentricity prediction accuracy
can be improved by the inclusion of the impact parameter as a feature in all these algorithms. We
discuss how the errors can be minimized and the accuracy can be improved to a great extent in all
the ranges of impact parameter and eccentricity predictions.

15:04 Transverse Spherocity and Multiplicity Dependence of R2 and P2 Correlation Functions in pp Collisions at s = 7 TeV Using PYTHIA8¶

Event shape observables such as transverse spherocity($S_0$) have evolved as a
powerful tool to separate soft and hard contributions in an event in small collision
systems. To understand this phenomenon, we used two-particle differential-number
correlation functions, $R_2$, and transverse momentum correlation functions, $P_2$, of
charged particles produced in pp collisions at the LHC center-of-mass energy
$\sqrt{\mathit{\text{s}}}$ = 7 TeV with the PYTHIA model. The $\mathrm{\Delta }\phi$-dependance of these correlation
functions in different multiplicity and $S_0$ classes are discussed . We find that these
correlation functions exhibit different shapes and sizes in both near-side(NS)
and away-side(AS) with multiplicity and $S_0$ classes. We see a strong correlation
in the NS and AS of these correlation functions for low-$S_0$(jetty-like),
which become weaker for high-$S_0$(isotropic). In addition, mean-${\mathit{\text{p}}}_{\mathrm{T}}$ of charged
particles for low-$S_0$, high-$S_0$ and $S_0$-integrated are discussed. Finally, it was
observed that $S_0$ should be a good observable as compared to multiplicity to
disentangle jetty and isotropic events in a small collision system.

15:05 First bent wafer-scale sensor in truly-cylindrical geometry for the ALICE ITS3 detector¶

A pillar of the ALICE upgrade program is the improvement of the Inner Tracking System (ITS2)
performance by the replacement of its three innermost layers during the next/third long shutdown of
the LHC (LS3) . The proposal is based on a vertex detector consisting of three cylindrical layers
composed by curved wafer-scale silicon sensors. The new detector will present a significant
reduction of the material budget, thus improving the spatial resolution of the reconstructed charged
tracks. Extensive characterization studies of bent single ALPIDE chips (used for the current ITS),
have been carried out to evaluate their performance under the mechanical stress involved in the
bending process and the results have demonstrated that none of the ALPIDE functionalities are
affected by the curvature effect. These tests on small sensors have opened the way to the
investigation of a large scale sensor: a full size demonstrator of a half-layer in a truly cylindrical
shape is being assembled for the first time, based on so called super-ALPIDE chips. Such activity
has required the development of special tools and procedures dedicated to bend and read out the
new pixel matrix.

Speaker: Arianna Grisel Torres Ramos (Istituto Nazionale di Fisica Nucleare)

Poster_90x70_QCD_at_Work.pdf

15:06 Bubble wall dynamics at the electroweak phase transition¶

Bubble nucleation is a key ingredient in a cosmological first order phase transition. The non-equilibrium bubble dynamics and the properties of the transition are controlled by the density perturbations in the hot plasma. We present, for the first time, the full solution of the linearized Boltzmann equation. Our approach, differently from the traditional one based on the fluid approximation, does not rely on any ansatz. We focus on the contributions arising from the top quark species coupled to the Higgs field during a first-order electroweak phase transition. Our results significantly differ from the ones obtained in the fluid approximation with sizeable differences for the friction acting on the bubble wall.

Speaker: Andrea Guiggiani (Università degli studi di Firenze)

15:07 Measurement of R2(Δη,Δφ) and P2(Δη,Δφ) correlation functions in pp collisions at s = 13 TeV using ALICE data¶

Two-particle normalized cumulants of particle number correlations ($R_2$) and transverse momentum correlations ($P_2$) measured as a function of relative pseudorapidity and azimuthal angle difference $(\mathrm{\Delta }\eta ,\mathrm{\Delta }\phi )$ provide key information about particle production mechanism, diffusivity, charge and momentum conservation in high-energy collisions. To complement the recent ALICE measurements in Pb--Pb collisions, as well as for better understanding of the jet contribution and nature of collectivity in small systems, we measure these observables in pp collisions at $\sqrt{\mathit{\text{s}}}$ = 13 TeV with similar kinematic range, 0.2 $<$ ${\mathit{\text{p}}}_{\mathrm{T}}$ $\le$ 2.0 $\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{\text{c}}$. The near-side and away-side correlation structures of $R_2$ and $P_2$ are qualitatively similar, but differ quantitatively. Additionally, a significantly narrower near-side peak is observed for $P_2$ as compared to $R_2$ for both charge-independent and charge-dependent combinations like in the recently published ALICE results in p--Pb and Pb--Pb collisions. Being sensitive to the interplay between underlying event and mini-jets in pp collisions, these results not only establish a baseline for heavy-ion collisions but also allow one to understand better signals which resemble collective effects in small systems.

15:08 Grey Tracks as probes of Hadronization Dynamics¶

Energetic quarks liberated from hadrons in nuclear deep-inelastic scattering propagate through the nuclear medium, interacting with it via several processes. These include quark energy loss through medium-stimulated gluon bremsstrahlung and intra-nuclear interactions of forming hadrons. One manifestation of these interactions is enhanced emission of low-energy charged particles, referred to as grey tracks.To make use of the theoretical components of the BeAGLE event generator to interpret grey track signatures of parton transport and hadron formation by comparing its predictions to E665 data. We extend the base version of BeAGLE by upgrading the PyQM module, which now offers four different options for the description of parton energy loss to the existing complement of hadronic and prehadronic interactions inside nuclei. The E665 data we used consist of multiplicity ratios for fixed-target scattering of 490 GeV muons on gaseous Xe normalized to liquid D as a function of the number of grey tracks produced. We compare multiplicity ratios for E665 grey tracks, which are defined as charged particles with momenta between 200 and 600 MeV/c and greater energy loss in detector materials than a minimum ionizing particle, to the predictions of BeAGLE, varying the PyQM options and parameters to determine which physics phenomena can be identified by these data. We divide the data into charge and rapidity classes for all charged hadrons, which have an average momentum of 5 GeV with a high-energy tail extending to nearly the beam energy.The BeAGLE predictions for forward rapidities (y$>$2 in the virtual photon-nucleon center of mass frame) agree with the E665 data for up to 2-4 grey tracks per event. Beyond that range, BeAGLE overpredicts the charged particle multiplicity ratios for all PyQM options in comparison to the data. For backward rapidities (y$<$-1), BeAGLE underpredicts multiplicity ratios for positively charged particles, which are primarily protons, while providing an excellent description of negatively charged particles. In BeAGLE we find that grey tracks are unaffected by modifications of the forward production, thus their production must be dominated by interactions with hadrons in the backward region, where they are much more numerous. We see a strong correlation between the number of grey tracks and the in-medium pathlength. This offers the advantage that a selection of certain particles in the forward region is unlikely to bias a centrality selection. Our energy loss model does not reproduce the suppression observed in the projectile region, even with rather large $\hat{q}$. These results lay an important foundation for future spectator tagging studies at the Electron Ion Collider, where both neutron and proton grey track studies will be feasible down to very small momenta.

15:09 Next to SV resummed prediction for pseudoscalar Higgs boson production at NNLO+NNLL―¶

We present first results on the resummation of Next-to-Soft Virtual (NSV) logarithms for the threshold production of pseudoscalar Higgs boson through gluon fusion at the LHC. These results are presented after resumming the NSV logarithms of the kind ${\log }^i(1-z)$ to $\overline{\text{NNLL}}$ accuracy and matching them systematically to the fixed order NNLO cross-sections. These results are obtained using collinear factorization, renormalization group invariance and recent developments in the NSV resummation techniques. The phenomenological implications of these NSV resummed results for 13 TeV LHC are studied and it is observed that these NSV logarithms are quite large. We also evaluate theory uncertainties and find that the renormalization scale uncertainties get reduced further with the inclusion of NSV corrections at various orders in QCD. We further study the impact of QCD corrections on mixed scalar-pseudoscalar states for different values of the mixing angle $\alpha$.

15:10 Strange Quark Matter from a Baryonic Approach¶

Cold and dense matter can be explored in a systematic way both in the high-density (perturbative QCD) and low-density (Chiral EFT) regime. However, the path connecting them is yet to be discovered. As a result, these descriptions are usually extrapolated into the intermediate density regime and then connected at some transition point. In this work I will present a model that has features of both, but within a unified description. The model contains hadronic degrees of freedom and is calibrated using nuclear matter properties; yet it exhibits a phase transition towards a “quark matter” phase that has approximately restored chiral symmetry, strangeness, and asymptotes to the conformal limit of the speed of sound. While this model can describe different qualitative scenarios regarding the phase transition and the strangeness onset, empirical constraints significantly narrow down the allowed parameter range. Moreover, hybrid stars above two solar masses are predicted, exhibiting a stiff “quark matter” core. This approach has implications for the hyperon puzzle and is also crucial for future exploration of inhomogeneous phases and the surface tension between hadron and quark phases.

Speaker: Mr Savvas Pitsinigkos (University of Southampton)

SQM_poster.pdf

15:11 Diffusion of heavy quarks in the early stages of high energy nuclear collisions¶

Heavy quarks are considered potential probes of the QCD matter produced in high-energy heavy-ion collisions. In the pre-equilibrium stage of relativistic heavy-ion collisions, strong quasi-classical gluon fields emerge at about ${\tau }_0=0.08$ fm/c which evolves according to the classical Yang-Mills (CYM) equations. These set of classical fields is known as Glasma. We study the diffusion of the heavy quarks, namely, charm and bottom quarks in the early stage of heavy-ion collisions. The diffusion in the evolving Glasma fields is compared with that of the Markovian-Brownian motion in a thermalized medium. The diffusion of HQs in the evolving glasma (EvGlasma) is investigated within the framework of Wong equations while we use famous Langevin equations for the Brownian motion with diffusion coefficients evaluated within the pQCD framework.We observe that for a smaller value of saturation scale, $Q_s$, the average transverse momentum broadening is approximately the same for the two cases, but for larger $Q_s$, Langevin dynamics underestimates the ${\sigma }_p$. This difference is related to the fact that heavy quarks in the Glasma fields experience diffusion in strong, coherent gluon fields that lead to a faster momentum broadening due to memory, or equivalently to a strong correlation in the transverse plane. We present another interesting result related to bottom quarks. We have observed that bottom quarks are more affected by the pre-equilibrium phase due to their large masses. Their slow motion makes them spend a long time within a single filament and experience the coherent gluonic fields for a longer time.

Speaker: Pooja - (IIT Goa)

15:12 Spectroscopic Analysis of exotic hadrons using effective theories¶

Predicition of tetraquark nad pentaquark masses have been done using effective theories and also there classification using different possible symmetries are done.

15:13 Inclusive semileptonic Lambda_b decays¶

Inclusive semileptonic decays of beauty baryons are studied using the heavy quark expansion to order 1/mb^3 at leading order in α_{s}
The case of a polarized decaying baryon is examined, with reference to Λ_b.
​The decays are studied in SM and in the extension based on the full set of D=6 semileptonic operators.

Speaker: Francesco Loparco (Istituto Nazionale di Fisica Nucleare)

poster.pdf

15:14 Multiquark-Oriented QCD Sum Rules¶

By systematic analysis, the contributions to two- and three-point Green functions that involve operators interpolating multiquark hadrons may be unambiguously and disjointly separated into those that may support a given multiquark and those that definitely do not. Upon evaluation of any such Green function within the framework of QCD sum rules, the rigorously identifiable latter contributions may and should be split off, whereas the former contributions constitute “multiquark-adequate” QCD sum rules potentially capable of providing information about the exotic hadron under study. The “multiquark-phile” contributions to Green functions necessarily involve at least two gluon exchanges of appropriate topology.

15:15 Semirelativistic potential modelling of bound states: Advocating due rigour¶

Within quantum field theory, an adequate formalism for the description of (two-particle) bound states, such as ordinary mesons, is provided by the Poincaré-covariant homogeneous Bethe‒Salpeter equation. From this — frequently rather involved — framework, however, it is not always quite easy to extract predictions. In view of this, a coarse idea of the bound-state spectrum to be expected may be gained by adhering to various simplifying approximations, which forms an entirely legitimate first step. The reliability of the insights deduced from the resulting simpler bound-state formalism may be straightforwardly examined by taking into account a couple of rigorous constraints on the emerging discrete spectrum. This has been illustrated for a variety of both singular interaction potentials, such as those of Coulomb or Yukawa shape, and nonsingular ones, such as the one proposed by Woods and Saxon.

15:16 Quantum Field Theory and its Anomalies for Topological Matter¶

Topology enters in quantum in quantum field theory in multiple forms: one of the
most important being the identification of the $\theta$ vacuum in QCD.
A very relevant aspect of this connection is through the phenomenon of
the anomalies, both chiral and conformal.
It has been realized recently that a class of materials, comprising topological insulators and Weyl semimetals,
exhibit the phenomenon of anomalies, which produce several exotic phenomena in these
materials. The presence of superconducting currents, resilient under perturbations and scattering
by impurities, indeed, has been associated with the phenomenon of quantum field theory anomalies. For instance, the description of the
response functions of these materials under thermal and mechanical stress involves general relativity, and
correlation functions of stress energy tensors, therefore, play an important role in this context.
In this work we discuss local and nonlocal effective actions relevant for their quantum field theory descriptions, their consistent
definition in Dimensional Regularization, and the long-range interactions appearing in their expansion respect to the external
sources.

Speaker: Mario Cretì (Istituto Nazionale di Fisica Nucleare)

poster.pdf

15:17 Gravitational coupling of QED and QCD: the study of 3 and 4-point functions in momentum space¶

Conformal symmetry has important consequences for strong interactions at short distances and provides powerful tools for practical calculations. Even if the Lagrangians of Quantum Chromodynamics (QCD) and Electrodynamics (QED) are invariant under conformal transformations, this symmetry is broken by quantum corrections. The signature of the symmetry breaking is encoded in the presence of massless poles in correlators involving stress-energy tensors. We present a general study of the correlation functions $TJJ$ and $TTJJ$ of conformal field theory (CFT) in the flat background limit in momentum space, following a reconstruction method for tensor correlators. Furthermore, we discuss the dimensional degeneracies of the tensor structures related to these correlators, and we present the perturbative realizations of $3$- and $4$-point functions in momentum space for QED and QCD.

Speaker: Riccardo Tommasi (INFN-Lecce)

PosterQCDGiugno2022.pdf

15:18 Holographic study of a Q Qbar chaotic dynamics in general thermal background¶

An holographic approach is applied to study chaotic behaviour of a strongly coupled Q Qbar pair in general thermal background. We consider two different backgrounds, one with finite temperature and baryon density, and one with finite temperature and constant magnetic field along a fixed direction. The results allow us to understand the chaotic dynamics dependence on the parameters of the background, to test the bound on chaos conjectured by Maldacena, Shenker and Standford (MSS) and a possible generalization.

Speaker: Nicola Losacco (Istituto Nazionale di Fisica Nucleare)

Nicola Losacco Poster.pdf

15:19 Relations among B_c to J/psi, eta_c form factors¶

We analyze the form factors that parametrize the B_c to J/psi, eta_c matrix elements of the operators in the effective b to c semileptonic Hamiltonian. We consider an expansion in nonrelativistic QCD, classifying the heavy quark spin symmetry breaking terms and expressing the form factors in terms of universal functions in a selected kinematical range. Using as an input the lattice QCD results for the $B_c\to J/\psi$ matrix element of the SM operator, we obtain information on these universal functions and other form factors.

Speaker: Martin Rodrigo Novoa Brunet (Istituto Nazionale di Fisica Nucleare)

main.pdf

15:20 Tracking Performances Studies for the Experimental Setup at the Electron-Ion Collider¶

The proposed Electron-Ion Collider (EIC) at the Brookhaven National Laboratory will study the collisions of polarized electrons with polarized protons and ions. The measurement of scattered electrons and charged particles will provide the main ingredients to achieve the physics objectives given below.
ˆ Distribution of sea quarks and gluons, and their spins inside the nucleon, basically 3D imaging of a nucleon.
ˆ The state of hadronic matter at extremely high gluon density (low-x regime).
ˆ Interaction of color-charged quarks and gluons, and colorless jets, with a nuclear medium.
In this way, the EIC will answer several important questions of QCD Physics. A Totally Hermetic Electron-Nucleus Apparatus (ATHENA) detector is one of the proposed configurations to study collisions at the EIC with very high tracking and particle identi cation performances. The ATHENA tracking detector consists of
barrel, forward, and backward detectors to have a wide pseudo-rapidity ( ) coverage. The central detector relies on three innermost silicon layers with a very small material budget ( 0.05% X0 per layer), two silicon barrel layers ( 0.55 % X0 per layer) and four micro-megas layers ( 0.40% X0 per layer) at larger radii.
The silicon layers are based on new-generation MAPS in 65 nm CMOS imaging technology. Forward and backward disks allow for reconstructing particles at larger. In this presentation, the tracking performance as studied in a full simulation of the ATHENA configuration will be described. A new collaboration is going to be formed by combining ATHENA and EIC Comprehensive Chromodynamics Experiment (ECCE) proto-collaborations and detector proposals (known as Detector-1 Collaboration): we are currently studying and optimizing the tracking performances for this setup in view of the Technical Design Report activity expected in the next year.

Speaker: Shyam Kumar (Istituto Nazionale di Fisica Nucleare)

Poster_ATHENA_Shyam_QCD_Conference.pdf

15:21 Excess-proton directed flow in 19.6 GeV Au+Au collisions¶

Directed flow of particles is an important feature seen in heavy-ion collisions and is a sensitive probe of the equation of state (EoS) of the matter produced in the collisions. Model calculations have also predicted that directed flow could be a sensitive probe of the softening of EOS associated with a first order phase transition. Directed flow of protons and anti-protons are of particular interest as they offer sensitivity to both the contributions from the transported quarks and also the medium generated component from the produced quarks. We will present measurements of the directed flow of protons and antiprotons from 19.6 GeV Au+Au collisions, using high statistics BES-II data from STAR. The new results have significantly reduced uncertainties and allow the study of how the two contributions vary over different centrality and transverse momentum regions.

Speaker: Spyridon Margetis (Kent State University)

QCDatWork2022_poster_Margetis.pdf

16:00 → 18:00 Session 11¶

Convener: Fulvia De Fazio (Istituto Nazionale di Fisica Nucleare)

16:00 SIDDHARTA2 and future perspectives¶

Speaker: Luca De Paolis (Istituto Nazionale di Fisica Nucleare)

Corvino_QCD@Work_20220630.pdf

SIDDHARTA2 and future perspectives Luca De Paolis.pdf

16:20 Pseudo- and quasi- PDFs in the BFKL approximation¶

Speaker: Giovanni Antonio Chirilli (University of Regensburg)

QCDatwork2022.pdf

16:40 Hadronic ligh-by-light contribution to (g-2)_mu¶

Speaker: Luigi Cappiello (Istituto Nazionale di Fisica Nucleare)

CappielloLecce2022.pdf

17:00 U(1)_A axial anomaly, eta', and topological susceptibility in the holographic soft-wall model¶

Speaker: Floriana Giannuzzi (Istituto Nazionale di Fisica Nucleare)

giannuzzi.pdf

17:20 Extra dimensions, compactification, and the Higgs mass controversy¶

Speaker: Carlo Branchina (LPTHE Sorbonne Université)

BranchinaC_Lecce.pdf

20:30 → 23:00 Workshop dinner¶

Thursday, 30 June ¶

09:00 → 10:40 Session 12¶

Convener: Giuseppe Eugenio Bruno (Istituto Nazionale di Fisica Nucleare)

09:00 Latest results from the NA62 and and NA48/2 experiments¶

Speaker: Michele Corvino (NA)

Corvino_QCD@Work_20220630.pdf

09:30 Spectroscopy of the excited Ds mesons¶

Speaker: Francesco De Bernardis (INFN)

FD_QCD@Work.pdf

09:50 Tsallis statistics and QCD thermodynamics¶

Speaker: Eugenio Megias (University of Granada)

megiasQCDWork22.pdf

10:10 TOTEM recent experimental results¶

Speaker: Francesco Saverio Cafagna (Istituto Nazionale di Fisica Nucleare)

totem_QCD_at_work2022.pptx

10:40 → 11:10 Coffee break

11:10 → 13:30 Session 13¶

Convener: Pietro Colangelo (Istituto Nazionale di Fisica Nucleare)

11:10 Bubble wall dynamics at the electro weak phase transition¶

Speaker: Luigi Delle Rose

QCDatWork_DelleRose.pdf

11:35 Additional baryons and mesons¶

In a particle theory model whose most readily discovered new particle is the ∼1TeV bilepton resonance in same-sign leptons, currently being sought at CERN's LHC, there exist three quarks D, S, T which will be bound by QCD into baryons and mesons. We consider the decays of these additional baryons and mesons whose detailed experimental study will be beyond the reach of the 14 TeV CERN collider and accessible only at an O(100 TeV) collider.

Speaker: Paul Frampton (University of Salento)

TALKhadrons.pdf

12:00 Naturalness and Hierarchy problems: a thorough analysis and an outrageous proposal¶

Speaker: Vincenzo Branchina (University of Catania)

V-BRANCHINA-LECCE-2022.pdf

12:25 The axion potential in quark matter¶

Speaker: Marco Ruggieri (Lanzhou University)

Ruggieri_V4.pdf

12:50 Chiral phase transitions, scaling window and crossovers in hot QCD¶

Speaker: Maria Paola Lombardo (Istituto Nazionale di Fisica Nucleare)