Identified particle distributions in pp and Au+Au collisions atsqrt sNN=200 GeV
Transverse mass and rapidity distributions for charged pions, charged kaons, protons and antiprotons are reported for {radical}sNN = 200 GeV pp and Au+Au collisions at RHIC. The transverse mass distributions are rapidity independent within |y| < 0.5, consistent with a boost-invariant system in this rapidity interval. Spectral shapes and relative particle yields are similar in pp and peripheral Au+Au collisions and change smoothly to central Au+Au collisions. No centrality dependence was observed in the kaon and antiproton production rates relative to the pion production rate from medium-central to central collisions. Chemical and kinetic equilibrium model fits to our data reveal strong radial flow and relatively long duration from chemical to kinetic freeze-out in central Au+Au collisions. The chemical freeze-out temperature appears to be independent of initial conditions at RHIC energies.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy andNuclear Physics. Division of Nuclear Physics; US National ScienceFoundation; German BMBF, France IN2P3, RA, RPL, EMN, United KingdomEPSRC, Brazil FAPESP, Russian Ministry of Science and Technology, ChinaMinistry of Education, NNSFC,Czech Republic SFOM, India DAE, DST, CSIR,Swiss National Science Foundation
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 900936
- Report Number(s):
- LBNL-55125; PRLTAO; R&D Project: NRNC; BnR: KB0201022; TRN: US0702406
- Journal Information:
- Physical Review Letters, Vol. 92; Related Information: Journal Publication Date: 03/19/2004; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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