Scaling properties of proton and anti-proton production in s(NN)**(1/2) 200-GeV Au+Au collisions - INSPIRE

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Scaling properties of proton and anti-proton production in s(NN)**(1/2) 200-GeV Au+Au collisions

PHENIX

Collaboration

May, 2003

6 pages

Published in:

Phys.Rev.Lett. 91 (2003) 172301

e-Print:

nucl-ex/0305036 [nucl-ex]

DOI:

10.1103/PhysRevLett.91.172301

Experiments:

BNL-RHIC-PHENIX

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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 centrality-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.

Note:

325 authors, 6 pages text, 4 figures, RevTeX 4. Minor changes to text and figures to meet PRL length restrictions: no changes to figures: resubmitted to PRL. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

nucleus nucleus: colliding beams
scattering: heavy ion
gold
hadron: multiple production
p: hadroproduction
anti-p: hadroproduction
yield: (p anti-p pi)
impact parameter: dependence
transverse momentum dependence
scaling

References(39)

Figures(0)

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