Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session G16: Mini-symposium: Early Time Dynamics, Jets, and the EICMini-Symposium
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Sponsoring Units: DNP Chair: Alexander Somov, Jefferson Lab/Jefferson Science Associate Room: Marquette VII - 2nd Floor |
Sunday, April 16, 2023 10:45AM - 11:21AM |
G16.00001: Probing nuclei with nuclei: UPCs at RHIC and the LHC Invited Speaker: Janet E Seger TBD |
Sunday, April 16, 2023 11:21AM - 11:33AM |
G16.00002: Study the effects of pre-hydrodynamic flow in heavy-ion collisions at the RHIC Beam Energy Scan program Mashhood Munir, Chun Shen The (3+1)D hydrodynamics + hadronic transport hybrid models are effective quantitative tools to study the dynamics of relativistic heavy-ion collisions and to extract the transport properties of the Quark-Gluon Plasma. For collisions with $sqrt{s_mathrm{NN}} sim O(10)$~GeV, the pre-equilibrium evolution before hydrodynamics plays an important role because it can reach up to 30\% of the total collision lifetime. In this work, we parameterize the transverse pre-hydrodynamic flow with a blast-wave-like profile, $v_perp(r_perp) = tanh(alpha r_perp)$, for individual hot spots. We will show that the flow profiles with certain values of $alpha$ can reproduce those generated from the free-streaming model. We further perform a systematic study on how the pre-hydrodynamic flow affects final-state observables in heavy-ion collisions at the RHIC Beam Energy Scan program. We will show its sensitivity to the anisotropic flow ratio $v_3/v_2$ and the HBT radii. |
Sunday, April 16, 2023 11:33AM - 11:45AM |
G16.00003: Measurement of Azimuthal Anisotropy of Charged Particles in PbPb Collisions with the ATLAS Detector Xiaoning Wang Heavy-ion collisions at the LHC produce a dense, hot medium known as the quark-gluon plasma (QGP). The QGP can be described by nearly ideal hydrodynamics, which results in its initial geometry being converted into azimuthal anisotropy in final state particles with low momentum in the plane transverse to the beam direction. High-momentum partons from the hard scatterings in these collisions lose energy as they traverse in the QGP. Because of the initial geometry of the QGP, partons produced at different angles, with respect to the collision event plane, traverse different path lengths of the medium leading to azimuthal-angle dependence of the yields of high transverse momentum ($p_T$) final-state particles. This study uses the scalar-product method to measure the $p_T$-dependent Fourier coefficients $v_n$, $ngeq2$, of the angular modulation of charged-particle distribution in PbPb collisions at $sqrt{s_{NN}}=5.02$ TeV, using the 2018 data recorded by the ATLAS detector. The low-$p_T$ $v_{n}$ are key parameters in constraining hydrodynamic models of the QGP, and the high-$p_T$ $v_{n}$ provide new information about the path-length dependence of the energy loss mechanism. This result is compared with current azimuthal-anisotropy measurements using charged particles and jets. With improved statistics, this measurement will explore a higher $p_T$ range than current measurements. |
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