Abstract
Measurements of event-by-event fluctuations of the mean transverse momentum in PbAu collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are somewhat smaller than recent measurements at RHIC. A possible non-monotonic behavior of the mean p T fluctuations as function of collision energy, which may have indicated that the system has passed the critical point of the QCD phase diagram in the range of μ B under investigation, has not been observed. The centrality dependence of mean p T fluctuations in PbAu is consistent with an extrapolation from pp collisions assuming that the non-statistical fluctuations scale with multiplicity. The results are compared to calculations by the rqmd and urqmd event generators.
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