Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions inAu+AuCollisions at RHIC

2014/02/28 by STAR Collaboration, L. Adamczyk, J. K. Adkins +98 · 4 citations
Mathematics · Physics and Astronomy · #Charge (physics) #Energy (signal processing) #Hadron #High-Energy Particle Collisions Research #Kurtosis #Mathematical analysis #Mathematics #Multiplicity (mathematics) #Negative binomial distribution #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Poisson distribution #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Rapidity #Sigma #Statistics #nucl-ex

paper · pdf · doi:10.1103/physrevlett.113.092301

published as Phys. Rev. Lett. 113, 092301 (2014) · 7 pages, 4 figures, Accepted by PRL

arxiv created 2014/08/26 · openalex publication_date 2014/08/26 · arxiv updated 2014/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

We report the first measurements of the moments---mean (M), variance (\ensuremathσ²), skewness (S), and kurtosis (\ensuremathκ)---of the net-charge multiplicity distributions at midrapidity in Au+Au collisions at seven energies, ranging from √s_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, \ensuremathσ²/M, S\ensuremathσ, and \ensuremathκ\ensuremathσ², with the expectations from Poisson and negative binomial distributions (NBDs). The S\ensuremathσ values deviate from the Poisson baseline and are close to the NBD baseline, while the \ensuremathκ\ensuremathσ² 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.

Citations

• The TOFp/pVPD time-of-flight system for STAR
• Error estimation for moment analysis in heavy-ion collision experiment
• Critical point of QCD at finite T and , lattice results for physical quark masses
• Event-by-event fluctuations in heavy ion collisions and the QCD critical point
• Non-Gaussian Fluctuations near the QCD Critical Point
• QCD equation of state with almost physical quark masses
• Glauber Modeling in High-Energy Nuclear Collisions
• The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions

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• More efficient formulas for efficiency correction of cumulants and effect of using averaged efficiency
• Mean-field potential effects in the cumulants of baryons from central Au+Au collision at Elab= 1.23 GeV/nucleon