{phi} meson production in Au + Au and p + p collisions at {radical}s{sub NN}=200 GeV
We report the STAR measurement of {psi} meson production in Au + Au and p + p collisions at {radical}s{sub NN} = 200 GeV. Using the event mixing technique, the {psi} spectra and yields are obtained at midrapidity for five centrality bins in Au+Au collisions and for non-singly-diffractive p+p collisions. It is found that the {psi} transverse momentum distributions from Au+Au collisions are better fitted with a single-exponential while the p+p spectrum is better described by a double-exponential distribution. The measured nuclear modification factors indicate that {psi} production in central Au+Au collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions (<N{sub bin}>). The systematics of <p{sub T}> versus centrality and the constant {psi}/K{sup -} ratio versus beam species, centrality, and collision energy rule out kaon coalescence as the dominant mechanism for {psi} production.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Nuclear Physics; National Science Foundation (NSF); BMBF Germany, IN2P3 and RA and RPL and EMN France, EPSRC United Kingdom, FAPESP Brazil, Russian Ministry of Science and Technology, Ministry of Education and NNSFC China, SFOM Czech Republic, FOM and UU The Netherlands, DAE and DST and CSIR India, Swiss National Science Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 841710
- Report Number(s):
- LBNL-56887; R&D Project: NRNC; TRN: US0502648
- Journal Information:
- Physics Letters B, Vol. 612, Issue 3-4; Other Information: Submitted to Physics Letters B: Volume 612, No.3-4; Journal Publication Date: 04/21/2005; PBD: 1 Jun 2004
- Country of Publication:
- United States
- Language:
- English
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