STAR measurement of system size and incident energy dependence of pt correlations at RHIC
Abstract
We present the results on measurement of event-by-event pt fluctuations and correlations for Cu+Cu collisions at sqrtsNN = 62.4 and 200 GeV from STAR experiment at RHIC. These results are compared with those from Au+Au collisions at sqrtsNN = 62.4 and 200 GeV to study the system size dependence. We find that the dynamical pt fluctuations are finite and decrease with increasing collision centrality. The pt correlations are studied as a function of collision centrality and are observed to decrease as we go from peripheral to central collisions. The square root of pt correlations scaled by mean pt are observed to be independent of beam energy as well as colliding ion size.
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