Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session GF: Bulk Matter and Correlations in Heavy-ion Collisions I |
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Chair: Jorge Noronha, University of Illinois at Urbana-Champaign Room: Hyatt Regency Hotel Celestin F |
Friday, October 28, 2022 2:00PM - 2:12PM |
GF.00001: Baryon number, strangeness, and electric charge fluctuations in hydrodynamics at the LHC Dekrayat K Almaalol, Travis Dore, Patrick Carzon, Debora Mroczek, Christopher Plumberg, Lydia Spychalla, Matthiew Sievert, Jacquelyn Noronha-Hostler At LHC energies it is possible to generate BSQ (baryon, strangeness, and electric) charge fluctuations from gluon splittings into quark anti-quark pairs, generated within the ICCING model. Here we propagate these conserved charges within an upgraded version of the hydrodynamic model, v-USPhydro, that conserves BSQ coupled to a 4-D equation of state {T,μB,μS,μQ} from Lattice Quantum Chromodynamics. We find that solely due to charge fluctuations that we expect large fluctuations in the chemical potentials {μB,μS,μQ} in local fluid cells at freeze-out even at LHC energies. |
Friday, October 28, 2022 2:12PM - 2:24PM |
GF.00002: QCD equation of state at finite density with a critical point from an alternative expansion scheme Micheal KAHANGIRWE, Pierre V Moreau, Olga Soloveva, Jamie M Karthein, Elena Bratkovskaya, Claudia Ratti, Damien Price, Steffen A Bass, Joerg Aichelin, Mikhail Stephanov In Ref. [1], results for the QCD equation of state from the lattice Taylor expansion were combined with the 3D Ising model critical behavior, to build a family of equations of state which match first principle results and contain a critical point in the expected universality class for QCD. This family of equations of state was limited to baryon chemical potentials from 0 to 450MeV, due to the limitations of the Taylor expansion. In Ref.[2], an alternative expansion scheme was introduced, for extrapolating the lattice QCD equation of state to finite chemical potential. In this research, we combine these two approaches to obtain a family of equations of state in the range of baryon chemical potentials from 0 to 700 MeV and Temperature from 30 MeV to 800 MeV, that match the lattice QCD results at a small density and contain a 3D-Ising model critical point. With these new equations of state, we substantially extend the coverage of the QCD phase diagram. |
Friday, October 28, 2022 2:24PM - 2:36PM |
GF.00003: Description of the first order phase transition region of an equation of state for QCD with a critical point Jamie M Karthein, Volker Koch, Claudia Ratti The search for signatures of the possible critical point in the QCD phase diagram have been a major effort in the theory and experimental community in the last decades. Besides those features directly attributed to the critical point, evidence of its existence can also be found by searching for the first order phase transition line, i.e. evidence that it is no longer a crossover. In this equation of state, we map the full coexistence region of the first order phase transition from the 3D Ising model onto the QCD phase diagram. The scaling equation of state in the mean field approximation is mapped onto the phase diagram of strongly-interacting matter, based on the principle of universal behavior in the vicinity of a critical point. A thermodynamic description of the thermodynamically metastable and unstable states of matter is achieved beyond that of the Maxwell construction. This analytical approach then follows the true curves for the coexistence and spinodal lines in the phase diagram. We will discuss the features observed upon mapping the mean field Ising model onto the QCD phase diagram as well as the behavior of the pressure, density, and entropy describing the equation of state. |
Friday, October 28, 2022 2:36PM - 2:48PM |
GF.00004: Contribution of Hadron Families to the QCD Equation of State Angel R Nava, Claudia Ratti Currently Lattice QCD simulations provide the best method of deriving the pressure of QCD as a function of the temperature. In the low-temperature regime, the thermodynamics can be understood in terms of a gas of non-interacting hadrons and resonances, but the contribution of the single hadronic species cannot be easily isolated. In this work we propose linear combinations of susceptibilities of conserved charges, that isolate the contribution of hadrons to the pressure of QCD according to their baryon number B, electric charge Q and strangeness S content. We build these partial pressures such that they vanish in the Stefan-Boltzmann limit. This generates a non-monotonic behavior which can be used to identify the melting temperature of each hadron family. We test the validity of these linear combinations in the Hadron Resonance Gas (HRG) model and compare them to available lattice QCD results. |
Friday, October 28, 2022 2:48PM - 3:00PM |
GF.00005: Equilibrium and Dynamical Properties of Hot and Dense Quark-Gluon matter from Holographic Black Holes. Joaquin J Grefa, Mauricio T Hippert, Claudia Ratti, Israel Portillo Vazquez, Romulo Rougemont, Jorge Noronha, Jacquelyn Noronha-Hostler By using gravity/gauge correspondence, we employ an Einstein-Maxwell-Dilaton model to compute the equilibrium and out-of-equilibrium properties of a hot and baryon rich strongly coupled quark-gluon plasma. The family of 5-dimensional holographic black holes, which are constrained to mimic the lattice QCD equation of state at zero density, is used to investigate the temperature and baryon chemical potential dependence of the equation of state [1]. We also obtained the baryon charge transport coefficients, the bulk and shear viscosities as well as the drag force and langevin diffusion coefficients associated with heavy quark jet propagation and the jet quenching parameter of light quarks in the baryon dense plasma, with a particular focus on the behavior of these observables on top of the critical end point and the line of first order phase transition predicted by the model [2]. |
Friday, October 28, 2022 3:00PM - 3:12PM |
GF.00006: Dynamical evolution of particle number fluctuations in hadronic transport Agnieszka M Sorensen We study particle number fluctuations in infinite matter using hadronic transport simulations of a box with periodic boundary conditions. The study focuses on matter initialized at a series of thermodynamically and mechanically stable points in the phase diagram, and in particular on the influence of the critical point on the equilibrated values of the fluctuations. We compare fluctuations from hadronic transport simulations against the values calculated using the underlying density functional equation of state, and we show that the fluctuations obtained from simulations agree with the underlying theory qualitatively everywhere in the phase diagram, and quantitatively as long as the simulated matter is far enough from the critical point. |
Friday, October 28, 2022 3:12PM - 3:24PM |
GF.00007: Proton-Cumulant Analyses in an Energy Scan of the STAR Fixed-Target Program at √s_{NN}= 3.2, 3.5, 3.9, 4.5, 5.2, 6.2, 7.2, and 7.7 GeV Zachary Sweger Non-monotonic variations in higher-order cumulants of proton number distributions produced in heavy-ion collisions are expected to be an indicator of a critical point in the QCD phase diagram. Proton-fluctuation results from Au+Au collisions in Beam Energy Scan I (BES-I) demonstrated deviations from the non-critical baseline, starting at √s_{NN} = 27 GeV and continuing to the lowest BES-I energy of √s_{NN} = 7.7 GeV. The STAR Fixed-Target Program has extended the energy range available at the Relativistic Heavy-Ion Collider down to √s_{NN} = 3.0 GeV. Proton-cumulant results at 3.0 GeV have indicated a return to the expected baseline behavior. The remaining fixed-target analyses aim to identify whether critical behavior is observed in the region between 3.2 and 7.7 GeV. Au+Au data from the Fixed-Target Program from √s_{NN} = 3.2 GeV to 7.7 GeV are now available and proton-cumulant analyses are underway. A status report on the challenges, methods, and statistical significance of these analyses will be presented. |
Friday, October 28, 2022 3:24PM - 3:36PM |
GF.00008: Event Plane Correlated Triangular Flow in Au+Au Collisions at √s_{NN} = 3 GeV from STAR Cameron T Racz Directed and elliptic flow have been extensively studied in heavy-ion collisions while triangular flow (v_{3}) could be further explored. v_{3} could prove very useful as a signal for Quark-Gluon Plasma (QGP) formation due to its sensitivity to QGP viscosity and the possibility that it is less affected by transport dynamics at very low energies [1]. This talk presents the current progress of an analysis on v_{3} for π, p, d, and t at the fixed target energy of √s_{NN} = 3.0 GeV, which is the lowest in phase-II of the Beam Energy Scan at STAR. The results show a positive correlation between v_{3} and the first-order event plane and a significant rapidity-odd v_{3} for p. In the future, these triangular flow measurements will be studied at other collision energies in STAR.
[1] J. Auvinen and H. Petersen. Evolution of elliptic and triangular flow as a function of √s_{NN} in a hybrid model. Phys. Rev. C, 88:064908, 2013. |
Friday, October 28, 2022 3:36PM - 3:48PM |
GF.00009: Directed flow of $\phi$ mesons in Au+Au collisions at the second phase of beam energy scan (BES-II) program from STAR Ding Chen The \(\phi\) meson is composed of strange quarks (\(s\overline s\)) and has a small hadronic interaction cross-section, which reduces the influence of late stage rescattering in heavy-ion collisions. |
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