Speaker
Marlene Nahrgang
(Goethe University Frankfurt and Frankfurt Institute for Advanced Studies (FIAS))
Description
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 only slightly negative for low $\sqrt{s_{NN}}$.
Primary authors
Marcus Bleicher
(Frankfurt Institute for Advanced Studies(FIAS))
Marlene Nahrgang
(Goethe University Frankfurt and Frankfurt Institute for Advanced Studies (FIAS))
Michael Mitrovski
(Physics Dept.,BNL, Brookhaven)
Reinhard Stock
(Frankfurt Institute for Advanced Studies(FIAS) and Institut fuer Kernphysik, University of Frankfurt)
Tim Schuster
(Frankfurt Institute for Advanced Studies(FIAS) and Institut fuer Kernphysik, University of Frankfurt)
