Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WGA: Exploring the Ultra-strong Electromagnetic Fields of Heavy-ion Collisions IInvited Workshop
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Chair: Daniel Brandenburg, Brookhaven National Laboratory Room: Hilton Waikoloa Village Queens 6 |
Monday, November 27, 2023 2:00PM - 2:30PM |
4WGA.00001: Energy Dependence of the Breit-Wheeler process in Heavy-Ion Collisions and its Application to Nuclear Charge Radius Measurements Invited Speaker: Zhangbu Xu The collision energy dependence of the cross section and the transverse momentum distribution of dielectrons from the Breit-Wheeler process in heavy-ion collisions are computed in the lowestorder QED and found to be sensitive to the nuclear charge distribution and the infrared-divergence of the ultra-Lorentz boosted Coulomb field. We demonstrate that the transverse-momentum component of Weizs¨ackerWilliams photons is due to the finite extent of the charge source and electric field component in the longitudinal direction. We further clarify the connection between the nuclear charge distribution and the kinematics of produced e +e − from the Breit-Wheeler process, and propose a criterion for the validity of the Breit-Wheeler process in relativistic heavy-ion collisions. Following this approach, the experimental measurements of the Breit-Wheeler process in ultra-relativistic heavy-ion collisions at RHIC and LHC can be used to quantitatively constrain the nuclear charge radius. The extracted parameters show sensitivity to the impact parameter dependence, and can be used to study the initial-state and final-state effects in hadronic interactions. |
Monday, November 27, 2023 2:30PM - 3:00PM |
4WGA.00002: Opportunities of strong-field physics in middle-energy heavy-ion collisions Invited Speaker: Hidetoshi Taya By colliding heavy ions at energies of O(1-10 GeV/nucleon), a super high-density state like that inside a neutron star may be created on Earth. Experiments are being planned worldwide to elucidate the properties of matter at such a high-density limit (e.g., FAIR, NICA, J-Parc-HI). In this talk, I would like to discuss the possibility that heavy-ion collisions at this energy scale (which I call "middle-energy" heavy-ion collisions) can be used not only to study the high-density limit but also provides a unique opportunity to study strong-field physics. |
Monday, November 27, 2023 3:00PM - 3:30PM |
4WGA.00003: Probing ultra-dense gluonic matter via UPCs at CMS Invited Speaker: Zaochen Ye Gluons are found to become increasingly dominant constituents of nuclear matter when being probed at higher energies or smaller Bjorken-$x$ values. This has led to the question of the ultimate fate of nuclear gluonic structure and its interaction with external probes at extreme density regimes. In ultrarelativistic heavy ion collisions, the electromagnetic fields surrounding an ion, quantized as linearly polarized quasi-real photons, can interact with the ion at a distance greater than the sum of their radii, known as ultraperipheral collisions (UPCs). In UPCs, the coherent heavy flavor vector meson via photonuclear interactions is of particular interest, as its cross section can directly probe the nuclear gluon density function at leading order. In this talk, we will present recent results on coherent vector meson photoproduction in 2018 UPC PbPb collisions at 5.02 TeV from the CMS experiment including a new measurement of coherent J/$psi$ photoproduction with the forward neutron tagging technique. We will discuss the related physics implications, as well as exciting opportunities in future LHC heavy ion runs. |
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