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

Abstract : 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. \\
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00087493
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Tuesday, July 25, 2006 - 9:01:08 AM
Last modification on : Wednesday, April 27, 2022 - 4:18:55 AM

Citation

J. Adams, M. M. Aggarwal, Z. Ahammed, J. Amonett, B. D. Anderson, et al.. Transverse-momentum $p_t$ correlations on $(\eta,\phi)$ from mean-$p_{t}$ fluctuations in Au-Au collisions at $\sqrt{s_{NN}} =$ 200 GeV. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2006, 32, pp.L37-L48. ⟨10.1088/0954-3899/32/6/L02⟩. ⟨in2p3-00087493⟩

Record views