Transverse-momentum pt correlations on (η,Φ) from mean-pt fluctuations in Au-Au collisions at √sNN = 200 GeV

Lee Barnby, CO Blyth, Leon Gaillard, Peter Jones, John Nelson, Anthony Timmins

Research output: Contribution to journalLetter

88 Citations (Scopus)

Abstract

We present first measurements of the pseudorapidity and azimuth (η, phgr) bin-size dependence of event-wise mean transverse-momentum langptrang fluctuations for Au–Au collisions at \sqrt{s_{\rm NN}} = 200 GeV. We invert that dependence to obtain pt autocorrelations on differences (ηΔ, phgrΔ) interpreted to represent velocity/temperature distributions on (η, phgr). The general form of the autocorrelations suggests that the basic correlation mechanism is parton fragmentation. The autocorrelations vary rapidly 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.
Original languageEnglish
Pages (from-to)L37-L48
JournalJournal of Physics G: Nuclear and Particle Physics
Volume32
DOIs
Publication statusPublished - 5 May 2006

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