Aug 12 – 18, 2012
US/Eastern timezone

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Getteing primordial baryon number fluctuation from observed proton number fluctuation in relativistic heavy ion collisions

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Correlations and fluctuations Poster Session Reception


Prof. Masayuki Asakawa (Osaka University)


We explore the relation between proton and nucleon numberfluctuations in the final state in relativistic heavy ion collisions. It is shown that the correlations between the isospins of nucleons in the final state are almost negligible over a wide range of collision energy. This leads to a factorization of the distribution function of the proton, neutron, and their antiparticles in the final state with binomial distribution functions. Using the factorization, we derive formulas to determine nucleon number cumulants, which are not direct experimental observables, from proton number fluctuations which are experimentally observable in event-by-event analyses. With a simple treatment for strange baryons, the nucleon number cumulants are further promoted to the baryon number ones. Experimental determination of the baryon number cumulants makes it possible to compare various theoretical stduies on them directly with experiments. Effects of nonzero isospin density on this formula are addressed quantitatively. It is shown that the effects are well suppressed over a wide energy range.

Primary author

Prof. Masayuki Asakawa (Osaka University)


Dr Masakiyo Kitazawa (Osaka University)

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