Fluctuations of conserved quantities such as baryon number, charge, and strangeness are sensitive to the correlation length of the hot and dense matter created in relativistic heavy-ion collisions and can be used to search for the QCD critical point. We report the first measurements of the moments of net-kaon multiplicity distributions in Au+Au collisions at sNN=7.7 , 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV. The collision centrality and energy dependence of the mean ( M ), variance ( σ2 ), skewness ( S ), and kurtosis ( κ ) for net-kaon multiplicity distributions as well as the ratio σ2/M and the products Sσ and κσ2 are presented. Comparisons are made with Poisson and negative binomial baseline calculations as well as with UrQMD, a transport model (UrQMD) that does not include effects from the QCD critical point. Within current uncertainties, the net-kaon cumulant ratios appear to be monotonic as a function of collision energy.

Collision energy dependence of moments of net-kaon multiplicity distributions at RHIC / Adamczyk, L., Adams, J.R., Adkins, J.K., Agakishiev, G., Aggarwal, M.M., Ahammed, Z., Ajitanand, N.N., Alekseev, I., Anderson, D.M., Aoyama, R., Aparin, A., Arkhipkin, D., Aschenauer, E.C., Ashraf, M.U., Attri, A., Averichev, G.S., Bai, X., Bairathi, V., Barish, K., Behera, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 785:(2018), pp. 551-560. [10.1016/j.physletb.2018.07.066]

Collision energy dependence of moments of net-kaon multiplicity distributions at RHIC

Contin, G.;
2018-01-01

Abstract

Fluctuations of conserved quantities such as baryon number, charge, and strangeness are sensitive to the correlation length of the hot and dense matter created in relativistic heavy-ion collisions and can be used to search for the QCD critical point. We report the first measurements of the moments of net-kaon multiplicity distributions in Au+Au collisions at sNN=7.7 , 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV. The collision centrality and energy dependence of the mean ( M ), variance ( σ2 ), skewness ( S ), and kurtosis ( κ ) for net-kaon multiplicity distributions as well as the ratio σ2/M and the products Sσ and κσ2 are presented. Comparisons are made with Poisson and negative binomial baseline calculations as well as with UrQMD, a transport model (UrQMD) that does not include effects from the QCD critical point. Within current uncertainties, the net-kaon cumulant ratios appear to be monotonic as a function of collision energy.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2941640
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