Midrapidity anti-proton to proton ratio from Au + Au collisions at s(NN)**(1/2) = 130-GeV

We report results on the ratio of mid-rapidity anti-proton to proton yields in Au+Au collisions at \rts = 130 GeV per nucleon pair as measured by the STAR experiment at RHIC. Within the rapidity and transverse momentum range of

|y|<0.5

and 0.4

<p_t<

1.0 GeV/

c

, the ratio is essentially independent of either transverse momentum or rapidity, with an average of

0.65\pm 0.01_{\rm (stat.)} \pm 0.07_{\rm (syst.)}

for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the

p

-\pb pair production becomes important at mid-rapidity, a significant excess of baryons over anti-baryons is still present.

Note:

5 pages, 3 figures, accepted by Phys. Rev. Lett

scattering: heavy ion
gold
hadron: multiple production
yield: (p anti-p)
charged particle: multiplicity
rapidity dependence
transverse momentum dependence
STAR
experimental results
Brookhaven RHIC Coll

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