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
- Files in This Item:
- Measurement of higher cumulants of net-charge multiplicity distributions in Au plus Au collisions at root s(NN)=7.7-200 GeV.pdfDownload
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