Revealing baryon number fluctuations from proton number fluctuations in relativistic heavy ion collisions

Details Revealing baryon number fluctuations from proton number fluctuations in relativistic heavy ion collisions Revealing baryon number fluctuations from proton number fluctuations in relativistic heavy ion collisions

2011-07-14

arxiv.org/abs/1107.2755v2

Physics

Nuclear Physics

Nuclear Theory

4 pages, no figures, version published in Physical Review C (Rapid Communication)

Scientific paper

Baryon number cumulants are invaluable tools to diagnose the primordial stage of heavy ion collisions if they can be measured. In experiments, however, proton number cumulants have been measured as substitutes. In fact, proton number fluctuations are further modified in the hadron phase and different from those of baryon number. We show that the isospin distribution of nucleons at kinetic freezeout is binomial and factorized. This leads to formulas that express the baryon number cumulants sorely in terms of proron number fluctuations, which are experimentally observable.

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