Multiplicity fluctuations in proton–proton and nucleus–nucleus collisions

2007/03/31 by V. P. Konchakovski, M. I. Gorenstein, Elena Bratkovskaya +1
Physics and Astronomy · #Atomic physics #Collision #Hadron #High-Energy Particle Collisions Research #Impact parameter #Multiplicity (mathematics) #Nuclear physics #Nucleon #Nucleus #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Statistical model #Statistics #nucl-th

paper · pdf · doi:10.1016/j.physletb.2007.06.032

published as Phys.Lett.B651:114-118,2007 · 9 pages, 4 figures, Phys. Lett. B, in press

arxiv created 2007/05/24 · openalex publication_date 2007/06/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the scaled variances of multiplicity fluctuations in nucleus-nucleus collisions at SPS and RHIC energies within the HSD transport model. The HSD results are compared with proton-proton data and with predictions of the hadron-resonance gas statistical model. We find that the HSD scaled variances ω_i for negatively, positively, and all charged hadrons in central nucleus-nucleus collisions remain close to the ω_i values in proton-proton collisions and increase with collision energy as the corresponding multiplicities per participating nucleon. The statistical model predicts very different behavior of ω_i. However, a comparison with preliminary NA49 data for the most central Pb+Pb collisions at SPS energies does not permit to distinguish the HSD and statistical model results. New measurements of the multiplicity fluctuations in nucleus-nucleus collisions in a wide energy region with large acceptance are needed to allow for a proper determination of the underlying dynamics.

Citations

• Open charm and charmonium production at relativistic energies
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