Higher Moments of Net Proton Multiplicity Distributions at RHIC

Aggarwal, M. M. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2010) Higher Moments of Net Proton Multiplicity Distributions at RHIC. Physical Review Letters, 105 (2). pp. 22302-6. ISSN 0031-9007

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We report the first measurements of the kurtosis (κ), skewness (S), and variance (σ2) of net-proton multiplicity (Np−Np¯) distributions at midrapidity for Au+Au collisions at √sNN=19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (μB) between 200 and 20 MeV. Our measurements of the products κσ2 and Sσ, which can be related to theoretical calculations sensitive to baryon number susceptibilities and long-range correlations, are constant as functions of collision centrality. We compare these products with results from lattice QCD and various models without a critical point and study the √sNN dependence of κσ2. From the measurements at the three beam energies, we find no evidence for a critical point in the QCD phase diagram for μB below 200 MeV.

Item Type: Article
Keywords: heavy ion, scattering gold p, multiplicity, measured anti-p, multiplicity, measured potential, chemical multiplicity, moment baryon number, susceptibility correlation, long-range impact parameter, dependence lattice field theory energy dependence quantum chromodynamics, critical phenomena STAR Brookhaven RHIC Coll 19.6, 62.4, 200.0 GeV-cms/nucleon
Date: July 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jun 2014 08:07
Last Modified: 24 Feb 2016 15:30
URI: http://digre.pmf.unizg.hr/id/eprint/2307

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