Elastic parton scattering and nonstatistical event-by-event mean-p{sub t} fluctuations in Au+Au collisions at {radical}(s{sub NN})=130 and 200 GeV

Nonstatistical event-by-event mean-p{sub t} fluctuations in Au+Au collisions at {radical}(s{sub NN})=130 and 200 GeV are analyzed in the multiphase transport model (AMPT) with string melting, and the results are compared with STAR data. The analysis suggests that in-medium elastic parton scattering may contribute greatly to the mean-p{sub t} fluctuations in relativistic heavy-ion collisions. Furthermore, it is demonstrated that nonstatistical event-by-event mean-p{sub t} fluctuations can be used to probe the initial partonic dynamics in these collisions. The comparison shows that with an in-medium elastic parton-scattering cross section {sigma}{sub p}=10 mb, AMPT with string melting can well reproduce {radical}(s{sub NN})=130 GeV data on the centrality dependence of nonstatistical event-by-event mean-p{sub t} fluctuations. The comparison also shows that the fluctuation data for {radical}(s{sub NN})=200 GeV Au+Au collisions can be well reproduced with {sigma}{sub p} between 6 and 10 mb.