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University of Frankfurt, Frankfurt, Germany.
Phys Rev Lett. 2001 May 21;86(21):4778-82. doi: 10.1103/PhysRevLett.86.4778.
We report results on the ratio of midrapidity antiproton-to-proton yields in Au+Au collisions at sqrt[s(NN)] = 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+/-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-p pair production becomes important at midrapidity, a significant excess of baryons over antibaryons is still present.
我们报告了相对论重离子对撞机（RHIC）上的STAR实验所测量的在每核子对质心能量√[s(NN)] = 130 GeV的金金碰撞中，快度中间区域反质子与质子产额之比的结果。在快度范围|y|<0.5和横向动量范围0.4<p(t)<1.0 GeV/c内，该比值基本与横向动量或快度无关，对于最小无偏碰撞，其平均值为0.65±0.01（统计误差）±0.07（系统误差）。在误差范围内，未观察到强烈的中心度依赖性。结果表明，在这个RHIC能量下，尽管在快度中间区域质子 - 质子对产生变得重要，但重子相对于反重子仍存在显著过量。
