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Published June 2006 | public
Journal Article

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


We present first measurements of the pseudorapidity and azimuth (η, Φ) binsize dependence of event-wise mean transverse-momentum p_t fluctuations for Au–Au collisions at √sNN = 200 GeV. We invert that dependence to obtain p_t autocorrelations on differences (ηΔ, ΦΔ) interpreted to represent velocity/temperature distributions on (η, Φ). 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.

Additional Information

© 2006 IOP Publishing Ltd. Received 28 January 2006. Published 5 May 2006. We thank the RHIC Operations Group and RCF at BNL and the NERSC Center at LBNL for their support. This work was supported in part by the HENP Divisions of the Office of Science of the US DOE, the US NSF, the BMBF of Germany, IN2P3, RA, RPL and EMN of France, EPSRC of UK, FAPESP of Brazil, the Russian Ministry of Science and Technology, the Ministry of Education and the NNSFC of China, IRP and GA of the Czech Republic, FOM of The Netherlands, DAE, DST and CSIR of the Government of India, Swiss NSF, the Polish State Committee for Scientific Research, STAA of Slovakia and the Korea Science and Engineering Foundation.

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