Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions in Au plus Au Collisions at RHIC

0433612 - ÚJF 2015 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Aggarwal, M. M. - Ahammed, Z. - Alekseev, I. - Alford, J. - Anson, C. - Aparin, A. A. - Arkhipkin, D. - Barnovská, Zuzana - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Hajková, O. - Pachr, M. - Rusňák, Jan - Šumbera, Michal - Tlustý, David - Vértési, Robert … Total 357 authors
Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions in Au plus Au Collisions at RHIC.
Physical Review Letters. Roč. 113, č. 9 (2014), 092301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA13-20841S; GA MŠMT LA09013
Institutional support: RVO:61389005
Keywords : STAR * QCD
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 7.512, year: 2014

We report the first measurements of the moments-mean (M), variance (sigma(2)), skewness (S), and kurtosis (kappa)-of the net-charge multiplicity distributions at midrapidity in Au + Au collisions at seven energies, ranging from root s(NN) = 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, sigma(2)/M, S sigma, and kappa sigma(2), with the expectations from Poisson and negative binomial distributions (NBDs). The S sigma values deviate from the Poisson baseline and are close to the NBD baseline, while the kappa sigma(2) 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.
Permanent Link: http://hdl.handle.net/11104/0237819