2009/03/31 by Marlene Nahrgang, Tim Schuster, Michael Mitrovski +2 · 48 citations
Engineering · Physics and Astronomy · #Baryon #Baryon number #Charge (physics) #Charge conservation #Grand canonical ensemble #High-Energy Particle Collisions Research #Kurtosis #Monte Carlo method #Net (polyhedron) #Nuclear physics #Nuclear reactor physics and engineering #Particle physics #Physics #Proton #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-012-2143-6
published in The European Physical Journal C 72(9) (Springer Science+Business Media)
openalex publication_date 2012/09/01 · arxiv created 2012/09/03 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Elab=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.