Mid-rapidity anti-proton to proton ratio from Au+Au collisions at √(sNN) = 130 GeV.
- Univ. of Frankfurt, Frankfurt (Germany)
- Purdue Univ., West Lafayette, IN (United States)
- Indiana Univ., Bloomington, IN (United States)
- Univ. of California, Davis, CA (United States)
- Laboratory for High Energy (JINR), Dubna (Russia)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). et al.
The authors report results on the ratio of mid-rapidity anti-proton-to-proton yields in Au+Au collisions at √(sNN) = 130 GeV per nucleon pair as measured by the Solenoidal Tracker at RHIC (STAR) experiment at the Relativistic Heavy Ion Collider (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 ± 0.01stat ± 0.07syst 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 mid-rapidity, a significant excess of baryons over antibaryons is still present.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); FOR
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 943211
- Report Number(s):
- ANL/HEP/JA-38317; PRLTAO; TRN: US0903025
- Journal Information:
- Physical Review Letters, Vol. 86, Issue May 2001; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- ENGLISH
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