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Higher Moments of Net Proton Multiplicity Distributions at RHIC

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; Hoffman, Alan Michael; Milner, Richard G; Redwine, Robert P; ... Show more Show less
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Abstract
We report the first measurements of the kurtosis (κ [kappa]), skewness (S), and variance (σ [sigma] [superscript 2]) of net-proton multiplicity (N [subscript p]-N [subscript p̅] ) distributions at midrapidity for Au+Au collisions at √sNN=19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (μ [mu] B) between 200 and 20 MeV. Our measurements of the products κ [kappa]σ [sigma][superscript 2] and Sσ [sigma], 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 κ [kappa] σ [sigma] [superscript 2]. From the measurements at the three beam energies, we find no evidence for a critical point in the QCD phase diagram for μ [mu] [subscript B] below 200 MeV.
Date issued
2010-07
URI
http://hdl.handle.net/1721.1/60667
Department
Bates Linear Accelerator Center; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical review letters
Publisher
American Physical Society
Citation
Aggarwal, M. et al. “Higher Moments of Net Proton Multiplicity Distributions at RHIC.” Physical Review Letters 105.2 (2010): n. pag. © 2010 The American Physical Society
Version: Final published version
ISSN
0031-9007

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