Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2014) Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC. Physical Review Letters, 113 (9). pp. 92301-7. ISSN 0031-9007

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Abstract

We report the first measurements of the moments—mean (M), variance (σ2), skewness (S), and kurtosis (κ)—of the net-charge multiplicity distributions at midrapidity in Au+Au collisions at seven energies, ranging from sNN−−−√=7.7 to 200 GeV, as a part of the Beam Energy Scan program at RHIC. The moments are related to the thermodynamic susceptibilities of net charge, and are sensitive to the location of the QCD critical point. We compare the products of the moments, σ2/M, Sσ, and κσ2, with the expectations from Poisson and negative binomial distributions (NBDs). The Sσ values deviate from the Poisson baseline and are close to the NBD baseline, while the κσ2 values tend to lie between the two. Within the present uncertainties, our data do not show nonmonotonic behavior as a function of collision energy. These measurements provide a valuable tool to extract the freeze-out parameters in heavy-ion collisions by comparing with theoretical models.

Item Type: Article
Date: August 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: mag. bibl. Marija Turković
Date Deposited: 15 Sep 2014 11:42
Last Modified: 17 Sep 2014 12:42
URI: http://digre.pmf.unizg.hr/id/eprint/2765

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