Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions in Au + Au Collisions at RHIC
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Adamczyk-2014-Beam energy dependence.pdf
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Author(s)
Balewski, Jan T.
Corliss, Ross
Hays-Wehle, James Prewitt
Leight, William Axel
Stevens, Justin
van Nieuwenhuizen, Gerrit Jan
Walker, M.
Date Issued
August 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. “Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions in Au + Au Collisions at RHIC.” Physical Review Letters 113, no. 9 (August 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We report the first measurements of the moments—mean (M), variance (σ[superscript 2]), skewness (S), and kurtosis (κ)—of the net-charge multiplicity distributions at midrapidity in Au + Au collisions at seven energies, ranging from √s[subscript 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, σ[superscript 2]/M, Sσ, and κσ[superscript 2], 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 κσ[superscript 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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.092301
