Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-17
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures
Scientific paper
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 Poisson distributions 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 ($b\leq 2.75$ fm) Pb+Pb/Au+Au collisions from $E_{lab}=2A$ GeV to $\sqrt{s_{NN}}=200$ 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 slightly negative only for low $\sqrt{s_{NN}}$.
Bleicher Marcus
Mitrovski Michael
Nahrgang Marlene
Schuster Tim
Stock Reinhard
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