Rapidity and centrality dependence of proton and antiproton production from197Au+197Au collisions at √SNN=130 GeV

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We report on the rapidity and centrality dependence of proton and antiproton transverse mass distributions from 197Au+197Au collisions at √SNN=130 GeV as measured by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Our results are from the rapidity and transverse momentum range of |y| <0.5 and 0.35<pt<1.00 GeV/c. For both protons and antiprotons, transverse mass distributions become more convex from peripheral to central collisions demonstrating characteristics of collective expansion. The measured rapidity distributions and the mean transverse momenta versus rapidity are flat within |y|<0.5. Comparisons of our data with results from model calculations indicate that in order to obtain a consistent picture of the proton (antiproton) yields and transverse mass distributions the possibility of prehadronic collective expansion may have to be taken into account.

Original languageEnglish
Article number041901
Pages (from-to)041901-1-041901-6
JournalPhysical Review C - Nuclear Physics
Issue number4
StatePublished - Oct 1 2004

Bibliographical note

Funding Information:
We thank Dr. W. Busza, Dr. M. Gyulassy, and Dr. V. Topor-Pop for exciting discussions. We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their support. This work was supported in part by the HENP Divisions of the Office of Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; SFOM of the Czech Republic, DAE, DST, and CSIR of the Government of India; and the Swiss NSF.

Publisher Copyright:
© 2004 The American Physical Society.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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