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

The STAR collaboration
Phys.Rev.Lett. 86 (2001) 4778, 2001.

Abstract (data abstract)
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 $0.4 <pt< 1.0$ 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 $p-\pb$ pair production becomes important at mid-rapidity, a significant excess of baryons over anti-baryons is still present.

  • Figure 2a


    pbar over p ratio vs. pt

  • Figure 2b


    pbar over p ratio vs. rapidity (y)

  • Figure 2c


    pbar over p ratio vs. centrality $(n_{ch}/n_{max})$

  • Figure 3


    pbar over p ratio for Heavy Ion and pp collisions

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