Phys. Rev. Lett. 86, 4778 - 4782 (2001)

Midrapidity Antiproton-to-Proton Ratio from Au+Au Collisions at sqrt[sNN]  =  130 GeV

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C. Adler et al.
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Received 27 December 2000

We report results on the ratio of midrapidity antiproton-to-proton yields in Au+Au collisions at sqrt[sNN]  =  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<pt<1.0 GeV/c, the ratio is essentially independent of either transverse momentum or rapidity, with an average of 0.65±0.01(stat)±0.07(syst) for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the p-p̅ pair production becomes important at midrapidity, a significant excess of baryons over antibaryons is still present.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v86/p4778
DOI: 10.1103/PhysRevLett.86.4778
PACS: 25.75.Ld

* Deceased.

See Also

Erratum: C. Adler et al., Erratum: Midrapidity Antiproton-to-Proton Ratio from Au+Au Collisions at sqrt[sNN]=130  GeV [Phys. Rev. Lett. 86, 4778 (2001)], Phys. Rev. Lett. 90, 119903 (2003)

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