Measurement of Nonrandom Event-by-Event Fluctuations of Average Transverse Momentum in √sNN = 200 GeV Au + Au and p + p Collisions

PHENIX Collaboration

Enokizono Akitomo

Hachiya Takashi

Homma Kensuke

Kohama Takeshi

Nakamura Tomoaki

Shigaki Kenta

Sugitate Toru

Physical Review Letters

Event-by-event fluctuations of the average transverse momentum of produced particles near midrapidity have been measured by the PHENIX Collaboration in √sNN = 200 GeV Au + Au, and p + p collisions at the Relativistic Heavy Ion Collider. The fluctuations are observed to be in excess of the expectation for statistically independent particle emission for all centralities. The excess fluctuations exhibit a dependence on both the centrality of the collision and on the pT range over which the average is calculated. Both the centrality and pT dependence can be well reproduced by a simulation of random particle production with the addition of contributions from hard-scattering processes.

proton-proton inclusive interactions

hard collision models

statistical models (elementary particles)

statistical models (nuclear)

heavy ion-nucleus reactions

nuclei with mass number 190 to 219

eng

American Physical Society

Copyright (c) 2004 The American Physical Society.

[ISSN] 0031-9007

[DOI] 10.1103/PhysRevLett.93.092301

[NCID] AA00773679

[DOI] http://dx.doi.org/10.1103/PhysRevLett.93.092301