Energy Dependence of Moments of Net-Proton Multiplicity Distributions at RHIC
Author(s)
Balewski, Jan T.; Hays-Wehle, James Prewitt; Leight, William Axel; Stevens, Justin; Corliss, Ross Cameron; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; ... Show more Show less
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We report the beam energy (√s[subscript NN] = 7.7–200 GeV) and collision centrality dependence of the mean (M), standard deviation (σ), skewness (S), and kurtosis (κ) of the net-proton multiplicity distributions in Au + Au collisions. The measurements are carried out by the STAR experiment at midrapidity (|y| < 0.5) and within the transverse momentum range 0.4< p[subscript T] < 0.8 GeV/c in the first phase of the Beam Energy Scan program at the Relativistic Heavy Ion Collider. These measurements are important for understanding the quantum chromodynamic phase diagram. The products of the moments, S[subscript σ] and κ[subscript σ][superscript 2], are sensitive to the correlation length of the hot and dense medium created in the collisions and are related to the ratios of baryon number susceptibilities of corresponding orders. The products of moments are found to have values significantly below the Skellam expectation and close to expectations based on independent proton and antiproton production. The measurements are compared to a transport model calculation to understand the effect of acceptance and baryon number conservation and also to a hadron resonance gas model.
Date issued
2014-01Department
Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “Energy Dependence of Moments of Net-Proton Multiplicity Distributions at RHIC.” Physical Review Letters 112, no. 3 (January 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114