Measurement of higher cumulants of net-charge multiplicity distributions in Au + Au collisions at √sNN = 7.7–200 GeV

Adare, A. and Makek, Mihael and Zolin, L. (PHENIX Collaboration) (2016) Measurement of higher cumulants of net-charge multiplicity distributions in Au + Au collisions at √sNN = 7.7–200 GeV. Physical Review C, 93 (1). 11901(R)-8. ISSN 0556-2813

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Abstract

We report the measurement of cumulants (Cn,n = 1,...,4) of the net-charge distributions measured within pseudorapidity (|η| < 0.35) in Au + Au collisions at √sNN = 7.7–200 GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., C1/C2, C3/C1) 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 C1/C2 and C3/C1 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.

Item Type: Article
Date: 19 January 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2016) by the American Physical Society. Received 30 June 2015; published 19 January 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Feb 2016 13:54
Last Modified: 03 Feb 2016 13:55
URI: http://digre.pmf.unizg.hr/id/eprint/4500

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