Bulletin of the American Physical Society
2023 APS April Meeting
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session Q15: Mini-symposium: New Theoretical Developments in Hot and Dense QCD |
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Sponsoring Units: DNP Chair: Robert Pisarski, Brookhaven National Laboratory Room: Marquette VI - 2nd Floor |
Monday, April 17, 2023 3:45PM - 4:21PM |
Q15.00001: Progress on hot and dense QCD from first principles Invited Speaker: Claudia Ratti TBD |
Monday, April 17, 2023 4:21PM - 4:33PM |
Q15.00002: The equation of state of dense nuclear matter from heavy-ion collisions Agnieszka M Sorensen, Dmytro Oliinychenko, Volker Koch, Larry D McLerran We use hadronic transport simulations with parametrizable mean-field interactions together with flow data from the STAR experiment at the center-of-mass energies of 3.0 and 4.5 GeV to constrain the equation of state of symmetric nuclear matter through Bayesian analysis. I will discuss the findings in the context of other known constraints from heavy-ion collisions and neutron star studies. |
Monday, April 17, 2023 4:33PM - 4:45PM |
Q15.00003: Study net proton fluctuations with (3+1)D hybrid simulations and machine learning Brandon Boudreaux Numerical simulations of the (3+1)D hydrodynamic + hadronic transport hybrid model provide quantitative descriptions of the dynamics of relativistic heavy-ion collisions from a few GeV to a few TeV [1]. The net proton cumulants in the final state encode important information about the QCD phase structure. However, studying high-order cumulants of net proton fluctuations require more than millions of simulation events, which poses a big computational challenge. In this work, we develop a neural network to mimic the net baryon charge evolution in the full (3+1)D hybrid model. The trained neural network enables us to efficiently compute the net proton cumulants. Based on the trained neural network, we study the net proton cumulants from fluctuations of initial-state baryon stopping modeled by the 3D Monte-Carlo Glauber model at the RHIC Beam Energy Scan energies.
[1] C. Shen and B. Schenke, “Longitudinal dynamics and particle production in relativistic nuclear collisions,” Phys. Rev. C 105, no.6, 064905 (2022)
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Monday, April 17, 2023 4:45PM - 4:57PM |
Q15.00004: Observable consequences of partial thermalization in relativistic nuclear collisions George S Moschelli, Sean Gavin, Zoulfekar Mazloum The discovery of flow-like azimuthal correlations in pA and high-multiplicity pp collisions raises profound questions about the onset of collective flow and its relation to hydrodynamics. We seek independent experimental information on the degree of thermalization in order to identify those hydrodynamic collision systems in which flow is sensitive to equilibrium QCD properties. We aim to develop a protocol for identifying the degree of thermalization using a combination of momentum and multiplicity correlation. To study the effect of thermalization on these correlations, we use Boltzmann equation in the relaxation time approximation with Langevin noise. We derive a new non-equilibrium transport equation for the two-body distribution function that is consistent with the conservation laws obeyed by microscopic scattering processes. We find that transverse momentum fluctuations in peripheral PbPb collisions at LHC markedly deviate from equilibrium behavior. We propose new measurements that can provide more refined information. |
Monday, April 17, 2023 4:57PM - 5:09PM |
Q15.00005: Effects of Conservation Laws on Particle Correlations in Relativistic Nuclear Collisions Harvir Dhindsa, Chun Shen The grand canonical statistical ensemble is usually assumed when simulating particle emission from the Quark-Gluon Plasma fluid created in relativistic heavy-ion collisions. These simulations conserve energy and momentum on an event-average level. This talk investigates how event-by-event local energy and momentum conservation [1] introduces non-trivial multi-particle correlations in Au+Au collisions at the RHIC. We will focus on the effects of local momentum conservation on the final-state particle dipolar flow and its correlations with the other anisotropic flow coefficients. We will also study the effects of micro-canonical sampling on particle spectra and anisotropic flow in small proton-nucleus collisions at RHIC and LHC. |
Monday, April 17, 2023 5:09PM - 5:21PM |
Q15.00006: Anomalous kaon correlations in heavy-ion collisions at LHC Joseph I Kapusta, Scott E Pratt, Mayank Singh As the quark-gluon plasma formed in heavy-ion collisions expands and cools, the approximate chiral symmetry is broken leading to formation of chiral condensates. The energy released in this condensation could lead to anomalous correlations in isospin fluctuations. Recently, the ALICE collaboration reported measuring such anomalous correlations in the kaon sector. In this talk I will discuss this measurement and show how less exotic statistical models cannot reproduce it. Energy from the strange quark condensation could be sufficient to explain it. |
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