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The energy dependence of p$_t$ angular correlations inferred from mean-pt fluctuation scale dependence in heavy ion collisions at the SPS and RHIC (2007)

Abstract
We present the first study of the energy dependence of p$_t$ angular correlations inferred from event-wise mean transverse momentum (p$_$t) fluctuations in heavy ion collisions. We compare our large-acceptance measurements at CM energies $\sqrt{^{s}NN}$=19.6, 62.4, 130 and 200 GeV to SPS measurements at 12.3 and 17.3 GeV. p$_t$ angular correlation structure suggests that the principal source of pt correlations and fluctuations is minijets (minimum-bias parton fragments). We observe a dramatic increase in correlations and fluctuations from SPS to RHIC energies, increasing linearly with ln$\sqrt{^s}NN}$ from the onset of observable jet-related p$_t$ fluctuations near 10 GeV.

Publication details
Download http://hal.in2p3.fr/in2p3-00137239/en/
Publisher HAL - CCSd - CNRS
Contributors Yvette Heyd
Repository CCSd/HAL : e-articles server (based on gBUS) (France)
Keywords Physics/Nuclear Experiment
Type ART_ACL
Coverage AU-AU COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; BY-EVENT FLUCTUATIONS; TRANSVERSE-MOMENTUM; ROOT-S(NN)=200 GEV; EQUILIBRATION; AUTOCORRELATIONS; PHI; ETA