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Measurement of higher cumulants of net-charge multiplicity distributions in Au plus Au collisions at root s(NN)=7.7-200 GeV

Title
Measurement of higher cumulants of net-charge multiplicity distributions in Au plus Au collisions at root s(NN)=7.7-200 GeV
Author
김용균
Keywords
FREEZE-OUT CONDITIONS; PHASE-TRANSITION; QCD; FLUCTUATIONS; MODEL; CHROMODYNAMICS; MOMENTS; DENSITY; PROTON; POINT
Issue Date
2016-01
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW C, v. 93, NO 1, Article number 011901, Page. 1-8
Abstract
We report the measurement of cumulants (C-n,n = 1, ..., 4) of the net-charge distributions measured within pseudorapidity (vertical bar eta vertical bar ˂ 0.35) in Au + Au collisions at root s(NN) = 7.7-200 GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., C-1/C-2, C-3/C-1) of the net-charge distributions, which can be related to volume independent susceptibility ratios, are studied as a function of centrality and energy. These quantities are important to understand the quantum-chromodynamics phase diagram and possible existence of a critical end point. The measured values are very well described by expectation from negative binomial distributions. We do not observe any nonmonotonic behavior in the ratios of the cumulants as a function of collision energy. The measured values of C-1/C-2 and C-3/C-1 can be directly compared to lattice quantum-chromodynamics calculations and thus allow extraction of both the chemical freeze-out temperature and the baryon chemical potential at each center-of-mass energy. The extracted baryon chemical potentials are in excellent agreement with a thermal-statistical analysis model.
URI
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.93.011901http://hdl.handle.net/20.500.11754/30475
ISSN
0556-2813; 1089-490X
DOI
10.1103/PhysRevC.93.011901
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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