Scaling properties of proton and anti-proton production in sqrt(s_NN) = 200 GeV Au + Au collisions

Preprint

30 May 2003

preprint
Published by arXiv in arXiv

Abstract

We report on the yield of protons and anti-protons, as a function of centrality and transverse momentum, in Au+Au collisions at sqrt(s_NN) = 200 GeV measured at mid-rapidity by the PHENIX experiment at RHIC. In central collisions at intermediate transverse momenta (1.5 < p_T < 4.5 GeV/c) a significant fraction of all produced particles are protons and anti-protons. They show a scaling behavior different from that of pions. The p-bar/pion and p/pion ratios are enhanced compared to peripheral Au+Au, p+p, and electron+positron collisions. This enhancement is limited to p_T < 5 GeV/c as deduced from the ratio of charged hadrons to pi^0 measured in the range 1.5 < p_T < 9 GeV/c.

Keywords

SCALING PROPERTIES
PROTON PRODUCTION
AU COLLISIONS
ANTI PROTONS
COLLISIONS
GEV/C
SQRT
S_NN
P_T

All Related Versions

Version 1, 2003-05-30, ArXiv
Version 2, 2003-07-15, ArXiv
Version 3, 2003-08-29, ArXiv
Published version: Physical Review Letters, 91 (17), 172301.

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