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Pierluigi Campana (LNF), Giulia Pancheri (LNF)03/06/2019, 09:15Talk
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Andrea Ghigo (LNF)03/06/2019, 09:30
On 9 February 1959 it was announced that the 1 GeV energy was reached by the Frascati synchrotron. This great achievement, considering the Italy of the post-war period, started the Frascati history on particle physics experiments and on development of particle accelerators and detectors. The synchrotron team then developed the accelerator concept by building the first electron and positrons...
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Niki Saoulidou (University of Athens, Greece)03/06/2019, 10:00
In this talk I will discuss photon measurements i) as tests of pQCD and
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used to tune PDFs ii) providing important information for BSM searches, and
iii) related with the Higgs Boson. I will go over LHC and non-LHC results
and give prospects for HL-LHC and beyond. -
Stefano Carrazza (MI)03/06/2019, 10:30
Precision phenomenology at the LHC requires accounting for both higher-order QCD and electroweak corrections as well as for photon-initiated subprocesses. In this talk I summarise the development history concerning: the inclusion of electroweak effects in parton distribution functions, the evolution of PDF algorithms for the determination of the photon PDF during the past decade, and the...
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Emilie Passemar (Indiana University/JLab)03/06/2019, 11:30
In this talk we will review some recent progress on light quark spectroscopy
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coming from $\eta$ and $\eta$' physics. -
Alessandro Pilloni (ROMA1)03/06/2019, 12:00
I will review the status of heavy quark spectroscopy, in particular the XYZ and pentaquark candidates.
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Charlotte Van Hulse03/06/2019, 12:30Gamma-Hadron Collisions
Various measurements of photoproduction in lepton-nucleon interactions are presented, along with their theoretical interpretations. These include spin-independent measurements of inclusive charm and beauty production, isolated photons and jets as well as exclusively produced hadrons. Results of hadron photoproduction in data taken with polarised leptons and nucleons are shown also.
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Xiaoyong Chu (Institute of High Energy Physics, Vienna)03/06/2019, 13:00
There may exist new sub-GeV particles, χ, which are electrically neutral but couple to the electromagnetic current via higher-dimensional operators. This talk focus on the possible detection of light state coupled to the photon through magnetic- and electric-dipole moments, or carrying an anapole moment or charge radius.
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New constraints, as well as future sensitivities, on the existence of... -
Pere Masjuan (Johannes Gutenberg-Universität Mainz, Institute für Kernphysik)03/06/2019, 15:00
In this talk we review the recent progress on the numerical determination of the hadronic contributions to the anomalous magnetic moment of the muon and we discuss the role of experimental data on the accuracy of its determination. Special emphasis on the light-by-light scattering contribution and on its main contribution, the pseudoscalar piece, is made. A state-of-the-art deviation between...
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Peter Schweitzer (UConn)03/06/2019, 15:30
The gravitational form factors of hadrons can be studied through hard-exclusive reactions, give access to the "last global unknown property" D-term, and promise insights on the internal forces inside hadrons from a unique perspective through their interpretation in terms of energy-momentum tensor densities. The current experimental and theoretical status is reviewed.
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Uri Karshon (Weizmann Institute)03/06/2019, 16:00
Measurement of open charm and beauty production cross sections in ep deep inelastic scattering (DIS) at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in a restricted kinematic range. Perturbative QCD calculations are compared to the combined data. Next-to-leading order QCD analysis is performed using these data together with combined inclusive HERA...
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Wenbiao Yan (USTC)03/06/2019, 17:00
In this talk, I will talk about recent progresses by two-photon processes at Belle. (a) meson transition form factor (TFF), a important input for calculation of hadronic light-by-light scattering contribution, which is one of dominant theory uncertainty source to muon g-2. With single tag method, the pi0/f0(980)/f2(1270) TFF is presented in this talk. (b) The cross section of hadron pair...
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Peter Lukin (Budker Institute of Nuclear Physics and Novosibirsk State University)03/06/2019, 17:20
We study process e+e- -> e+e-eta' in the double-tag mode and measure for the first time the gamma gamma -> eta' formfactor
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F(Q^2_1,Q^2_2) in the momentum-range 2 < Q^2_1,Q^2_2 < 60 GeV^2. The analysis is based on data with an integrated luminosity
469 fb^-1 collected at the PEP-II e+e- collider with the BABAR detector at center-of-mass energies near 10.6 GeV. The results for the formfactor... -
Dario Moricciani (LNF)03/06/2019, 17:40
The KLOE-2 experiment completed its data-taking at the e+e- DAPHNE collider in Frascati, achieving the integrated luminosity goal of more than 5 fb-1 at the phi peak. KLOE-2 represents the continuation of KLOE with an upgraded detector and an extended physics program. The new four stations installed to tag electrons and positrons from the reaction e+e- -> e+e-gammagamma -> e+e-X, give the...
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Christoph Florian Redmer (Institute for Nuclear Physics, Johannes Gutenberg - University Mainz)03/06/2019, 18:00
Motivated by the recent developments in data-driven approaches to improve the hadronic light-by-light scattering calculations of the Standard Model prediction of the anomalous magnetic moment of the muon $a_\mu$, the BESIII collaboration has embarked on a dedicated two-photon physics program. The momentum dependence of transition form factors of single pseudoscalar mesons, as well as of...
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Iwona Grabowska-Bold (AGH University of Science and Technology)04/06/2019, 09:15
We present the observation of the light-by-light scattering process, γγ → γγ, in lead-lead collisions at √sNN = 5.02 TeV. The analysis is conducted using 1.73nb-1 of data collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering event candidates are selected in events with two photons produced exclusively, with small diphoton transverse momentum and small...
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Justin Williams (CERN)04/06/2019, 09:35
Measurements with photon-photon collisions in CMS are reviewed.
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Oliver Gould (University of Helsinki)04/06/2019, 09:55
Magnetic monopoles are present in generic classes of models beyond the Standard Model and there are currently searches underway for them at the LHC. The strong magnetic fields present in peripheral heavy ion collisions can produce monopoles by the (dual) Schwinger effect. I will outline recent progress in understanding this process and argue that heavy ion collisions may be the most...
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Antoni Szczurek (Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow)04/06/2019, 10:15
So far light-by-light scattering ($\gamma\gamma\to\gamma\gamma$) was not accessible for experiments because the corresponding cross section is rather low. Measurements of diphotons in ultra-peripheral collisions (UPCs) of lead-lead have been reported recently by the ATLAS [1] and CMS Collaborations [2]. Our theoretical results based on equivalent photon approximation in the impact parameter...
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Victor Goncalves (Universidade Federal de Pelotas)04/06/2019, 10:35
In this talk we will present a brief review of the recent results for the particle production by $\gamma \gamma$ interactions at $pp/pA/AA$ collisions. In particular, the dilepton production will be discussed, as well the background associated to pomeron induced interactions. Finally, the probe of the X(4350) in $\gamma \gamma$ interactions at the LHC will be discussed.
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Oleksandr Borysov (Deutsches Elektronen-Synchrotron DESY)04/06/2019, 11:25
The talk presents the LUXE experiment which plans on using the European XFEL electron beam at DESY with an energy of 17.5 GeV and a high intensity optical laser to study non-perturbative QED phenomena. The main focus of the experiment will be the measurement of the rate of laser assisted electron-positron pair production in collisions of high energy photons with an intensive laser beam and...
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Antoni Szczurek (Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow), Dr Marta Łuszczak (Faculty of Mathematics and Natural Sciences, University of Rzeszow, Poland), Dr Forthomme Laurent (Helsinki Institute of Physics), Wolfgang Schaefer (Institute of Nuclear Physics PAN)04/06/2019, 11:45
Photon-induced processes in proton-proton interactions have become recently very topical. The large energy at the LHC, when combined with relatively large luminosity at run II, allows to start the exploration of such processes.
We discuss production of $W^+ W^-$ pairs and $t \bar t$ quark-antiquark pairs in proton-proton collisions induced by two-photon fusion including, for a first time,...
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Lucian Harland-Lang (University of Oxford)04/06/2019, 12:05
We analyze in detail the LHC prospects for charged electroweakino searches, decaying to leptons, in compressed supersymmetry scenarios, via exclusive photon-initiated pair production. This provides a potentially increased sensitivity in comparison to inclusive channels, where the background is often overwhelming. We pay particular attention to the challenges that such searches would face in...
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Dr Frédéric Kapusta (LPNHE Paris)04/06/2019, 12:25
The analytical asymptotic cross section for arbitrary masses was given a few years ago.
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Obtaining an analytical approach of the onset of the asymptotic regime is an interesting challenge.
The current status will be reviewed. -
Izabela Babiarz (Institute of Nuclear Physics, Polish Academy of Sciences), Prof. Victor P. Goncalves (Instituto de Fisica e Matematica Universidade Federal de Pelotas (UFPel)), Dr Roman Pasechnik (Department of Astronomy and Theoretical Physics, Lund University), Dr Wolgang Sch\"afer (nstitute of Nuclear Physics, Polish Academy of Sciences), Prof. Antoni Szczurek (Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow)04/06/2019, 12:45
We discuss $\gamma^* \gamma^* \to \eta_c(1S)\, , \,\eta_c(2S)$ transition form factor for both virtual photons. The general formula is given. We use different models for the $c \bar c$ wave function (LFQM or the ones obtained from the solution of the Schr\"odinger equation for different $c \bar c$ potentials: harmonic oscillator, Cornell, logarithmic, power-law and Buchm\"uller-Tye).
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We... -
Giancarlo Rossi (University of Roma Tor Vergata)04/06/2019, 14:45
The 2015 LHCb discovery of an exotic structure (denoted by $P_c^+$) decaying in $J/\psi \,p$ and conjectured to be a penta-quark state has triggered a renewed interest in the possible existence of multiquark states not predicted by the naive quark model. In this talk we present some considerations on $P_c$ photo-production experiments, aimed at testing its multi-quark interpretation in the...
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40. Vector meson photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions at the LHC with ALICEMichal Broz (CTU Prague)04/06/2019, 15:15
Vector mesons are plenteously produced in ultra-peripheral collisions where the impact parameter is larger than the sum of the radii of the two projectiles, implying that electromagnetic induced processes become dominant.
Light vector meson photoproduction cross sections can be used to study Glauber-Gribov shadowing effects at the hadronic level while the photoproduction of heavy vector...
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Charlotte Van Hulse04/06/2019, 15:45
The LHCb collaboration has measured central exclusive production of J/ψ, ψ(2S), and Υ mesons as well as J/ψJ/ψ and J/ψψ(2S) meson pairs in proton-proton collisions. The analyses of Υ and charmonium pairs are performed at the centre-of-mass energies of 7 TeV and 8 TeV, and those of J/ψ and ψ(2S) are done at 7 TeV and 13 TeV. The analysis at 13 TeV involves the usage of new shower counters....
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Tim Linden (The Ohio State University)04/06/2019, 16:45
The Sun is not expected to be a bright gamma-ray source above 1 GeV, due to the moderate strength of solar magnetic fields. However, the Sun may act as a passive gamma-ray source, through the hadronic interaction of galactic cosmic rays with the Solar atmosphere. The Fermi-LAT has detected a bright solar gamma-ray flux, which implies that solar magnetic fields efficiently redirect incoming...
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Christoph Weniger (GRAPPA, University of Amsterdam)04/06/2019, 17:15Talk
The particle nature of dark matter remains one of the most mysterious and urgent research questions of modern particle physics and cosmology. Despite decades of research, the mass of possible dark matter particles is only constrained to within 80 orders of magnitude or so. Astronomical observations spanning the full electromagnetic spectrum allow to search for dark matter particles across the...
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Giorgio Galanti (INAF, Osservatorio Astronomico di Brera)04/06/2019, 17:45
Axion-like particles (ALPs) are light, neutral, (pseudo-)scalar bosons predicted by several extensions of the Standard Model of particle physics such as the String Theory and are supposed to interact primarily only with two photons. In the presence of an external magnetic field photon-ALP oscillations may occur and produce sizable astrophysical effects in the very-high energy (VHE) band....
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Sergio Petrera (INFN and Gran Sasso Science Institute )05/06/2019, 09:15
In this talk some recent results from the Pierre Auger Collaboration
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will be presented. These include the measurement of the energy
spectrum of cosmic rays over a wide range of energies, studies of the
cosmic-ray mass composition with the fluorescence and surface detector
of the Observatory, studies on the anisotropies in the arrival
direction of cosmic rays at different scales and the... -
Michela Negro (TO)05/06/2019, 09:45
The gamma-ray sky has been revealed in the last decade by the Fermi Large Area Telescope (LAT), offering an outstanding picture of our Universe at the highest energies. The majority of this gamma-ray emission has been attributed to known processes involving cosmic-ray interactions with the interstellar medium within our Galaxy. Another important contribution is represented by the gamma-ray...
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Silvia Manconi (Università degli Studi di Torino)05/06/2019, 10:15
An excess in the flux of cosmic positrons at Earth above 10 GeV has been measured by Pamela, Fermi-LAT and with unprecedented precision by AMS-02. The observed flux cannot be explained by the production of positrons in the spallation reaction of hadronic cosmic rays (CRs) with the interstellar medium. Various interpretations have been invoked to explain this excess, such as the production in...
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Giuseppe Greco (Urbino University/INFN-Firenze)05/06/2019, 11:15
The search for electromagnetic counterparts or neutrino emissions from gravitational-wave sources engages a wide scientific community. Here, we outline the pathway that led to the birth of multi-messenger astronomy with the first direct observations of the gravitational-wave signals measured to date, focusing on the new challenges of LIGO and Virgo Observing Run 3 (O3) and the beginning of the...
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Alessio Berti (TO)05/06/2019, 11:45
The very high energy sky comprises many astrophysical sources originating from explosive or flaring events on different timescales, from fraction of seconds to years. These transient sources are largely observed and monitored in different bands of the electromagnetic spectrum, including very high energy (VHE, $E>100$ GeV) gamma rays. Furthermore, transient sources are associated with systems...
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Dario Gasparrini (ROMA2)05/06/2019, 12:15
The recent discovery of a diffuse neutrino flux of astrophysical origin by IceCube started the search to identify the cosmic sources of this emission. Synergy with other experiments could be a useful mean of investigation and in particular, the combination of neutrino/gamma-ray information is motivated by the fact that both radiations may be produced in the same astrophysical particle-cascades...
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Piergiorgio Fusco (BA)05/06/2019, 12:45
While the Fermi gamma-ray telescope lives its 11th year in orbit, new particle and gamma-ray space detectors are in operation as DAMPE (DArk Matter Particle Explorer), or are in the development stage as HERD (High Energy Cosmic Radiation Detector) and e-Astrogam. DAMPE was launched in 2015 by a collaboration of Chinese, Italian and Swiss scientific institutions and performs high-quality...
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Maciej Trzebinski (IFJ PAN)05/06/2019, 14:45
In 2017, ATLAS has been equipped with a new, dedicated detector system
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allowing measurements of forward protons scattered at small angles in
diffractive and electromagnetic processes. These ATLAS Forward Proton
detectors (AFP) can operate during standard high-luminosity LHC runs
and collect large amounts of integrated luminosity. This gives a
possibility to study rare interactions, in... -
Justin Williams (CERN)05/06/2019, 15:15
Prospects for photon-photon measurements with CMS and TOTEM will be reviewed.
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Marco Cipriani (ROMA1)05/06/2019, 15:45
The CMS experiment at the LHC features a high-resolution homogeneous electromagnetic calorimeter (ECAL). Its excellent performance in the reconstruction of high-energy photons has played a key role in the discovery of the Higgs boson and the measurement of its properties. The High-Luminosity LHC (HL- LHC) is expected to deliver an integrated luminosity 20 times larger than the LHC, allowing to...
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David d'Enterria (CERN)05/06/2019, 16:45
The production of the Higgs boson in photon-photon interactions with proton and nucleus beams at three colliders planned or proposed at CERN --- the high-luminosity Large Hadron Collider (HL-LHC), the high-energy LHC (HE-LHC), and the Future Circular Collider (FCC) --- is studied. The cross sections for the process A$\,\gamma\gamma\,$A$\rightarrow$(A)$\,$H$\,$(A), with the ions A surviving the...
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Boris Shwartz (Budker Institute of Nuclear Physics, Novosibirsk State University)05/06/2019, 17:05
At present experiments with a new Belle II detector at SuperKEKB collider has started at KEK (Japan). These new experiments will continue and widen the studies began at the previous experiments with the Belle detector. The luminosity of the SuperKEKB collider will exceed the previous one by about 40 times, amounting to $8\times 10^{35}$cm$^{-2}$s$^{-1}$. The main features of the collider and...
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Agnieszka Luszczak (Cracow University of Technology)05/06/2019, 17:25
We investigate the exclusive photoproduction of J/ψ mesons in ultraperipheral heavy-ion collisions in the color dipole approach.
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We use the color dipole formulation of Glauber-Gribov theory to calculate the diffractive amplitude on the
nuclear target. We compare our results to recent published data on exclusive J/ψ production in ultraperipheral
lead-lead collisions at √sNN=2.76 and... -
Jens Erler (IF-UNAM)05/06/2019, 17:45
A global survey of weak mixing angle measurements at low and high energies is presented first. Then I will discuss theoretical uncertainties in precision observables with special emphasis on their correlations. The important role of vacuum polarization in global fits will also be addressed before fit results are presented.
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Gennady Kozlov (JINR)06/06/2019, 09:15
Dark photons
G.A. Kozlov
Bogolyubov Laboratory of Theoretical Physics Joint Institute for Nuclear Research, Joliot Curie st., 6, Dubna, Moscow region, 141980 RussiaAbstract
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The couplings of the Standard Model sector to the scale invariant degrees of freedom can open the possibility to study dark photons (DP). The model for the DP particle solvable in 4-dimensional space-time is... -
Clara Taruggi (LNF)06/06/2019, 09:35
Among the theoretical models addressing the dark matter problem, the category based on a secluded sector is attracting increasing interest. The PADME experiment, at the Laboratori Nazionali di Frascati (LNF) of INFN, is designed to be sensitive to the production of a low mass gauge boson A’ of a new U(1) symmetry holding for dark particles. This 'dark photon’ is weakly coupled to the photon of...
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Letizia Peruzzo (JGU Mainz)06/06/2019, 09:55
The high-intensity setup, trigger system flexibility and detector performance make the NA62
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experiment at CERN particularly suitable to perform direct searches for long-lived hidden-sector particles, such as dark photons, dark scalars, axion-like particles, and heavy neutral leptons, using kaon and pion decays as well as operating the experiment in dump mode.
Results from NA62 will be... -
Marcin Berlowski06/06/2019, 10:15
In March 2018, the KLOE-2 experiment completed its data-taking at the e+e- DAPHNE collider in Frascati, collecting more than 5 fb-1 at the phi peak, thus extending the KLOE physics program with an upgraded detector. The KLOE detector is well suited for the study of fully neutral final states due to its large radius and a hermetic electromagnetic calorimeter, providing excellent timing and...
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Federica Giacchino (LNF)06/06/2019, 11:15
The nature of the dark matter is still an unsolved mystery and its identification represent a big challenge for model builders and experimentalists. For many years the WIMP miracle has been considered the most promising solution among the Dark Matter candidates. Recently lower energy scales have attracted increasing interest. I will present the axion-like particle (ALP) as a possible...
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Erwann Masson (Subatech, IN2P3-CNRS (FR))06/06/2019, 11:35
In high-energy hadron collisions, direct photons can be produced at different stages and are of particular interest to study the hot QCD medium since they escape it without being affected.
At high transverse momentum ($p_{\text{T}}$), their production is dominated by high-$p_{\text{T}}$ parton fragmentation and hard-scattering processes between partons. The latter can be accessed...
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Daiki Sekihata (Center for Nuclear Study, the University of Tokyo)06/06/2019, 11:55
We review production of light neutral mesons, neutral pions and eta mesons, measured in pp, pA and AA collisions at LHC energies. Neutral meson production provides exploration of various physics topics: In pp collisions one can test pQCD predictions, study structure function in proton and fragmentation functions, and build a reference for pA and AA collisions; In pA collisions, it enables to...
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Marius Höfer (Universität Zürich)06/06/2019, 12:15
Based on [1904.01044], I present recent results of a Next-to-Next-to-leading order (NNLO) calculation of inclusive isolated photon and photon-plus-jet production using the Monte-Carlo event generator NNLOJET. In order to mimic experimental photon isolation criteria we apply a staged isolation procedure. A Frixione-type isolation with small cone size is used to ensure numerical stability,...
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Alessio Tiberio (Università degli Studi di Firenze & INFN)06/06/2019, 12:35
The main purpose of the LHCf experiment is to test the hadronic interaction models used in ground based cosmic rays experiments to simulate air-showers induced by ultra-high-energy cosmic rays in the Earth atmosphere. Since most of the air-shower energy flow is contained in the very forward region (where soft-QCD processes dominate), Monte Carlo simulations must rely on phenomenological...
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Miriam Calvo Gomez (La Salle. Universitat Ramon Llull)06/06/2019, 12:55
Rare and radiative b-hadron decays are sensitive probes of New Physics through the study of branching fractions, angular observables, CP asymmetries and measurements of the polarisation of the photon emitted in the decay.
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The LHCb experiment is ideally suited for the analysis of these decays due to its high trigger efficiency, as well as excellent tracking and particle identification... -
Matteo Sorbara (Università degli Studi di Roma Tor Vergata & INFN Sezione Roma Tor Vergata)07/06/2019, 09:15
The muon anomalous magnetic moment, $a_\mu=\frac{g-2}{2}$, is a low energy observable that can be both measured and computed with high precision. Therefore it provides an important test of the Standard Model (SM) and it is a sensitive probe for new physics. In particular, any deviation from the Standard Model theoretical value can be due to Beyond Standard Model Physics contribution, such as...
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Boris Shwartz (Budker Institute of Nuclear Physics)07/06/2019, 09:45
The project of the Super C-Tau factory (SCTF) is under development now at BINP in Novosibirsk. This electron-positron collider is intended for experiments in the energy range from 2 to 6 GeV with a luminosity of $10^{35}$ cm$^{-2}$s$^{-1}$. The high luminosity will provide a wide physical program that includes many fundamental issues like a study of mixing in the D meson system, search for...
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Valery Telnov (Budker INP)07/06/2019, 10:15
Using Compton scattering of 0.5 \mum laser photons on existing 17.5 GeV (spent) electron beams from European XFEL one can obtain a gamma-gamma collider with W<12 GeV . This energy region is not covered by Super-B collider or LHC (the later due QCD backgrounds). Such a collider will be a nice place for application of modern technologies: powerful lasers, optical cavities, SC linacs and...
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Massimo Ferrario (INFN-LNF)07/06/2019, 11:15
On the wake of the results obtained so far at the SPARC_LAB test-facility at LNF, we are currently investigating the possibility to design and build a new multi-disciplinary user-facility, equipped with a soft X-ray Free Electron Laser (FEL) driven by a ~1 GeV high brightness linac based on plasma accelerator modules. EuPRAXIA@SPARC_LAB is conceived as an innovative and evolutionary tool for...
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Valeri Khoze (IPPP, University of Durham)07/06/2019, 11:45
I discuss the possibilities for using the LHC as a photon colliding
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machine. The photon parton
density is quite precisely known and I consider the
implications for the LHC phenomenology. In addition, the colour singlet
nature of the photon means that it can readily lead to exclusive or
semi-exclusive events, with limited or no extra particle production in
the final state. I will show... -
Elke-Caroline Aschenauer (BNL)07/06/2019, 12:15
Understanding the properties of nuclear matter and its emergence through the underlying partonic structure and dynamics of quarks and gluons requires a new experimental facility in hadronic physics known as the Electron-Ion Collider (EIC). The EIC will address some of the most profound questions concerning the emergence of nuclear properties by precisely imaging gluons and quarks inside...
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Michael Klasen07/06/2019, 12:45
We discuss recent highlights in SM photon physics at the LHC, new opportunities at its forthcoming high-luminosity runs, and perspectives for its possible high-energy upgrade and a future electron-ion collider (EIC). Particular emphasis is put on the role of photoproduction processes in understanding the nuclear structure and interactions at high energies and on searches for photon-like...
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Pasquale Di Nezza (LNF)07/06/2019, 13:15Talk
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Vyacheslav Ivanov (Budker Institute of Nuclear Physics)
Since 2010 two detectors, CMD-3 and SND, have been collecting statistics at the electron-positron collider VEPP-2000. The collected integrated luminosity is about 200 pb$^{-1}$ for each detector in the wide c.m. energy range from 0.32 up to 2 GeV. The current status of analysis as well as recent results are reported. Special attention is paid to the studies of e^+e^- \to \pi^+\pi^-,...
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