Impact of resonance regeneration and decay on the net-proton fluctuations in a hadron resonance gas

Abstract

We investigate net-proton fluctuations as important observables measured in heavy-ion collisions within the hadron resonance gas (HRG) model. Special emphasis is given to effects which are a priori not inherent in a thermally and chemically equilibrated HRG approach. In particular, we point out the importance of taking into account the successive regeneration and decay of resonances below the chemical freeze-out, which lead to a randomization of the isospin of nucleons and thus to additional fluctuations in the net-proton number. We find good agreement between our model results and the recent STAR measurements of the higher-order moments of the net-proton distribution.

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• Lattice QCD and heavy ion collisions: a review of recent progress
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• The QCD Critical Point and Related Observables
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• Determination of freeze-out conditions from fluctuation observables measured at RHIC
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