Energy Dependence of Moments of Net-Proton Multiplicity Distributions at RHIC
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Adamczyk-2014-Energy Dependence of.pdf
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Author(s)
Balewski, Jan T.
Hays-Wehle, James Prewitt
Leight, William Axel
Stevens, Justin
Corliss, Ross Cameron
van Nieuwenhuizen, Gerrit J
Walker, Matthew H
Date Issued
January 2014
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.112.032302
