Transverse-momentum $p_t$ correlations on $(η,φ)$ from mean-$p_{t}$ fluctuations in Au-Au collisions at $\sqrt{s_{NN}} = $ 200 GeV

Details Transverse-momentum $p_t$ correlations on $(η,φ)$ from mean-$p_{t}$ fluctuations in Au-Au collisions at $\sqrt{s_{NN}} = $ 200 GeV Transverse-momentum $p_t$ correlations on $(η,φ)$ from mean-$p_{t}$ fluctuations in Au-Au collisions at $\sqrt{s_{NN}} = $ 200 GeV

2005-09-23

arxiv.org/abs/nucl-ex/0509030v3

J.Phys.G32:L37-L48,2006

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 3 figures

Scientific paper

10.1088/0954-3899/32/6/L02

We present first measurements of the pseudorapidity and azimuth $(\eta,\phi)$ bin-size dependence of event-wise mean transverse momentum $$ fluctuations for Au-Au collisions at $\sqrt{s_{NN}} = 200$ GeV. We invert that dependence to obtain $p_t$ autocorrelations on differences $(\eta_\Delta,\phi_\Delta)$ interpreted to represent velocity/temperature distributions on ($\eta,\phi$). The general form of the autocorrelations suggests that the basic correlation mechanism is parton fragmentation. The autocorrelations vary strongly with collision centrality, which suggests that fragmentation is strongly modified by a dissipative medium in the more central Au-Au collisions relative to peripheral or p-p collisions. \\

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