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Kaifeng Shen06/04/2022, 18:30Ultra-peripheral collisionsPoster
Strong electromagnetic field arising from the Lorentz-contraction and a large number of charges (Z) in the colliding nuclei at ultrarelativistic speeds can generate a large flux of quasi-real photons. Consequent photon-induced interactions could reasonably explain the observed enhancements of $J/\psi$ and $e^{+}e^{-}$ pair productions at very low transverse momenta ($p_{T}$) in peripheral...
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Jian Zhou (USTC)06/04/2022, 18:34Ultra-peripheral collisionsPoster
Recently, significant enhancements of $e^{+}e^{-}$ pairs at very low transverse momentum ($p_{T}$) were observed by the STAR collaboration in peripheral Au+Au collisions. The excess can be explained by photon-photon interactions induced by the extremely strong electromagnetic field produced by the fast-moving heavy ions. These photon-photon interactions could provide a novel probe to the...
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Adam Matyja (Polish Academy of Sciences (PL))06/04/2022, 18:38Ultra-peripheral collisionsPoster
The ALICE experiment has significantly upgraded its detectors. It will make possible to perform new measurements in the Ultra Peripheral Collisions (UPCs) of lead nuclei for the integrated luminosity of $\mathcal{L}^{\rm Pb-Pb}=13$/nb during Run 3 and Run 4. For Run 5 and beyond, a completely new next-generation heavy-ion experiment ALICE 3 is proposed. The new detector system will cover
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much... -
Katarzyna Mazurek (IFJ PAN)06/04/2022, 18:42Ultra-peripheral collisionsPoster
The photon-photon interaction in ultra-relativistic heavy-ion collision is a source of the $(e^+,e^-)$ pairs. The photon-photon fusion leads to the lepton creation in the broad configuration space around ''collision'' point. Those created close to heavy nuclei may undergo strong interaction with them.
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The impact parameter space distributions of electrons and positrons are calculated within... -
Dr Mariola Klusek-Gawenda (Institute of Nuclear Physics Polish Academy of Sciences)06/04/2022, 18:46Ultra-peripheral collisionsPoster
We present a study of photon-photon scattering in the mass range $W_{\gamma \gamma}<5$ GeV. We extend earlier calculations of this cross section for $W_{\gamma \gamma}>5$~GeV into the low mass range where photoproduction of the pseudoscalar resonances $\eta$, $\eta'(958)$ contributes to two-photon final states. We present the elementary photon-photon cross section as a function of diphoton...
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Qun Wang (University of Science and Technology of China), Shi Pu, Ren-jie Wang (USTC)06/04/2022, 18:50Ultra-peripheral collisionsPoster
The lepton pair production in ultraperipheral collisions is studied in the classical field approximation. We derive a general form of the cross section in terms of photon distributions that depend on the transverse momentum and coordinate based on the wave packet form of nuclear wave functions. Such a general form of the cross section in the classical field approximation contains the results...
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Dagmar Bendova (Czech Technical University in Prague (FNSPE))06/04/2022, 18:54Ultra-peripheral collisionsPoster
We present the latest predictions for several QCD processes at low-x in the color dipole picture which are of interest for current hadron-hadron and future electron-hadron colliders. The predictions are derived using the solution to the Balitsky-Kovchegov equation for proton and nuclear targets with the collinearly improved kernel and including the impact-parameter dependence. Two different...
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Michael Murray (The University of Kansas (US))06/04/2022, 18:58Ultra-peripheral collisionsPoster
We present, for the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both pomeron-lead and pomeron-proton topologies. The analysis is performed over 10.4 units of pseudorapidity at a nucleon-nucleon center-of-mass energy of 8.16 TeV, i.e. almost 300 times higher than previous measurements of diffractive production in proton-nucleus collisions. For...
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Agnieszka Ewa Ogrodnik (AGH University of Science and Technology (PL))06/04/2022, 19:02Ultra-peripheral collisionsPoster
In heavy-ion collisions, the highly relativistic ions act as a strong source of electromagnetic radiation, enhanced by the large proton charge number $Z$. Ultra-peripheral collisions (UPC) offer a natural environment in which to observe the photon-initiated production of Beyond Standard Model (BSM) processes with QED couplings. One such process sensitive to BSM effects is light-by-light...
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Xiaolin Wang (South China Normal University (CN))06/04/2022, 19:06Ultra-peripheral collisionsPoster
The LHCb detector is a single-arm forward spectrometer covering the pseudorapidity range 2 < 𝜂 < 5, designed for the study of particles containing bottom or charm quark. The study of exclusive vector meson photoproduction in ultra-peripheral lead-lead collisions is essential to understand physics at low Bjorken x. In particular, coherent J/ψ and ψ(2S) mesons are promising probes of nuclear...
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Wolfgang Schaefer06/04/2022, 19:10Ultra-peripheral collisionsPoster
We discuss the role of $c \bar c g$-Fock states in the diffractive photoproduction of J/ψ-mesons on heavy nuclei. We build on our earlier description of the process in the color-dipole approach, where we took into account the rescattering of $c \bar c$ pairs using a Glauber-Gribov form of the dipole-nucleus amplitude. The results of our calculations are compared to recent data on the...
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Ms Runa Takahama (Nara Women's University)06/04/2022, 19:14Strongly coupled systemsPoster
The PHENIX experiment was operated at BNL-RHIC which collides heavy ions at
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relativistic energy to create a quark-gluon plasma (QGP), in which quarks and gluons are deconfined. It is well known that the QGP produced in heavy ion collisions exhibits collective motion. In recent years, similar collective effect have been discovered in small systems at high energy collisions. This result... -
Nicole Lewis (Brookhaven National Laboratory)06/04/2022, 19:18Ultra-peripheral collisionsPoster
Photonuclear collisions are one of the simplest processes that can happen in a heavy-ion collision. They occur when one nucleus emits a quasi-real photon which interacts with the other colliding nucleus, similar to an $e+A$ collision except that the photon tends to have a much smaller virtuality. Photonuclear collisions can be used to study bulk properties of the medium such as collectivity...
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Javier Alberto Murillo Quijada (Universidad de Sonora (MX))06/04/2022, 19:22Ultra-peripheral collisionsPoster
Since 2011 a wide variety of measurements suggest the existence of strong collectivity in collisions of small systems such as proton-proton (pp) and proton-nucleus (pPb) with hydrodynamic models and gluon saturation in the initial state as two theory alternatives showing consistency with the observations. These results raise the question as to whether such phenomena may be present in even...
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