Measurement of cumulants of conserved charge multiplicity distributions in Au plus Au collisions from the STAR experiment

被引：9
作者：
Pandav, Ashish [1 ]
机构：
[1] HBNI, Natl Inst Sci Educ & Res, Sch Phys Sci, Jatni 752050, India
来源：
NUCLEAR PHYSICS A | 2021年 / 1005卷
关键词：
QCD phase diagram; QCD critical point; conserved charge fluctuations; cumulants;
D O I：
10.1016/nuclphysa.2020.121936
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We report on collision-centrality dependence of cumulants of event-by-event net-proton and net-charge distributions in Au+Au collisions for center-of-mass energy of root s(NN) = 54.4 GeV from the STAR experiment. Strong collision-centrality dependence is observed for cumulants (C-n, n <= 4) of the net-proton and net-charge distributions. The cumulant ratios C-3/C-2, C-4/C-2, and C-6/C-2 exhibit a weak collision-centrality dependence. The C-6/C-2 of net-proton and net-charge distributions for most central gold nuclei collisions at root s(NN) = 54.4 GeV show positive sign while it remains negative for net-proton distribution at root s(NN) = 200 GeV for the same collision system and centrality. To understand effects of acceptance and baryon number conservation, the measurements are compared to expectations from the UrQMD and HIJING models calculated within the STAR detector acceptance.
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页数：4
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