Energy Dependence of Moments of Net-Proton, Net-Kaon, and Net-Charge Multiplicity Distributions at STAR

32nd Winter Workshop on Nuclear Dynamics

Xu, Ji^1,2

Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan

430079, China^1

Lawrence Berkeley National Laboratory, Berkeley

CA

94720, United States^2

关键词: Au+Au collisions;    Baseline calculations;    Conserved quantity;    Correlation lengths;    Energy dependence;    Heavy ion collision;    Multiplicity distributions;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/736/1/012002/pdf
DOI  :  10.1088/1742-6596/736/1/012002

来源: IOP

【 摘 要 】

One of the main goals of the RHIC Beam Energy Scan (BES) program is to study the QCD phase structure, which includes the search for the QCD critical point, over a wide range of chemical potential (μB). Theoretical calculations predict that fluctuations of conserved quantities, such as baryon number (B), charge (Q), and strangeness (S), are sensitive to the correlation length of the dynamical system. Experimentally, higher moments of multiplicity distributions have been utilized to search for the QCD critical point in heavy-ion collisions. In this paper, we report recent efficiency-corrected cumulants and cumulants ratios of the net- proton, net-kaon, and net-charge multiplicity distributions in Au+Au collisions at √sNN= 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV collected in the years 2010, 2011, and 2014 with STAR at RHIC. The centrality and energy dependence of the cumulants up to the fourth order, as well as their ratios, are presented. Furthermore, the comparisons with baseline calculations (Poisson) and non-critical-point models (UrQMD) will also be discussed.