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Net-baryon-, net-proton-, and net-charge kurtosis in heavy-ion collisions within a relativistic transport approach

Abstract : We explore the potential of net-baryon, net-proton and net-charge kurtosis measurements to investigate the properties of hot and dense matter created in relativistic heavy-ion collisions. Contrary to calculations in a grand-canonical ensemble we explicitly take into account exact electric and baryon charge conservation on an event-by-event basis. This drastically limits the width of baryon fluctuations. A simple model to account for this is to assume a grand-canonical distribution with a sharp cut-off at the tails. We present baseline predictions of the energy dependence of the net-baryon, net-proton and net-charge kurtosis for central (b≤2.75 fm) Pb+Pb/Au+Au collisions from E lab=2A GeV to sNN−−−√=200 GeV from the UrQMD model. While the net-charge kurtosis is compatible with values around zero, the net-baryon number decreases to large negative values with decreasing beam energy. The net-proton kurtosis becomes only slightly negative for low sNN−−−√ .
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http://hal.in2p3.fr/in2p3-00903420
Contributor : Dominique Girod <>
Submitted on : Tuesday, November 12, 2013 - 11:07:10 AM
Last modification on : Wednesday, January 15, 2020 - 1:30:02 PM

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Marlene Nahrgang, T. Schuster, M. Mitrovski, R. Stock, M. Bleicher. Net-baryon-, net-proton-, and net-charge kurtosis in heavy-ion collisions within a relativistic transport approach. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2012, 72, pp.2143. ⟨10.1140/epjc/s10052-012-2143-6⟩. ⟨in2p3-00903420⟩

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