标题：Energy, Rapidity and Transverse Momentum Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at CERN SPS /// Energy and system size dependence of multiplicity fluctuations in nucleus-nucleus collisions at CERN SPS Energies
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Multiplicity fluctuations in the forward hemisphere were studied for positively, negatively and
all charged hadrons produced in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV.
The multiplicity distributions and their scaled variances are presented as a function of collision
energy, rapidity and transverse momentum. The distributions have a bell-like shape and the scaled
variance changes monotonously with energy in the range from 0.8 to 1.2. No indication of the
critical point is observed.
The string-hadronic model UrQMD reproduces results on the scaled variance. The predictions
of the hadron-resonance gas model obtained within the grand-canonical and canonical ensembles
for the scaled variance disagree with the data.
