Net-proton probability distribution in heavy ion collisions
Abstract
We compute net-proton probability distributions in heavy ion collisions within the hadron resonance gas model. The model results are compared with data taken by the STAR Collaboration in Au-Au collisions at sNN=200 GeV for different centralities and for the central energy bin at sNN=39 GeV. We show that, in central Au-Au collisions at sNN=39 GeV, the measured distribution is consistent with the hadron resonance gas model but differs from the predictions of the model at sNN=200 GeV. At the highest energy, deviations from model results are smaller for peripheral collisions. We argue that such properties of probability distributions are expected if the freeze-out conditions probed by fluctuations are located close to the QCD crossover transition.
- Publication:
-
Physical Review C
- Pub Date:
- December 2011
- DOI:
- 10.1103/PhysRevC.84.064911
- arXiv:
- arXiv:1107.4267
- Bibcode:
- 2011PhRvC..84f4911B
- Keywords:
-
- 12.38.Mh;
- 25.75.-q;
- 24.60.-k;
- Quark-gluon plasma;
- Relativistic heavy-ion collisions;
- Statistical theory and fluctuations;
- High Energy Physics - Phenomenology
- E-Print:
- 4 pages, 2 figures