M. Bleicher et al., Event-by-event fluctuations of the charged particle ratio from nonequilibrium transport theory - art. no. 061902, PHYS REV C, 6206(6), 2000, pp. 1902
The event-by-event fluctuations of the ratio of positively to negatively ch
arged hadrons an predicted within the UrQMD model. Corrections for finite a
cceptance and finite net charge are derived. These corrections are relevant
to compare experimental data and transport model results to previous predi
ctions. The calculated fluctuations at RHIC and SPS energies are shown to b
e compatible with a hadron gas, thus, deviating by a factor of 3 from the p
redictions for a thermalized quark-gluon plasma.