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Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC

Abstract : We report the first measurements of the moments -mean ($M$), variance ($\sigma^{2}$), skewness ($S$) and kurtosis ($\kappa$) -of the net-charge multiplicity distributions at mid-rapidity in Au+Au collisions at seven energies, ranging from $\sqrt {{s_{\rm NN}}}$=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, which are expected to diverge at the QCD critical point. We compare the products of the moments, $\sigma^{2}/M$, $S\sigma$ and $\kappa\sigma^{2}$ with the expectations from Poisson and negative binomial distributions (NBD). The $S\sigma$ values deviate from Poisson and are close to NBD baseline, while the $\kappa\sigma^{2}$ values tend to lie between the two. Within the present uncertainties, our data do not show clear evidence of non-monotonic behavior as a function of collision energy.
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http://hal.in2p3.fr/in2p3-00962295
Contributor : Sylvie Flores <>
Submitted on : Friday, March 21, 2014 - 9:04:18 AM
Last modification on : Thursday, February 7, 2019 - 2:58:47 PM

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L. Adamczyk, W. Borowski, S. Kabana. Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC. Physical Review Letters, American Physical Society, 2014, 113, pp.092301. ⟨10.1103/PhysRevLett.113.092301⟩. ⟨in2p3-00962295⟩

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