phi meson production in Au + Au and p + p collisions at root S-NN=200 GeV

0308785 - ÚJF 2008 RIV NL eng J - Journal Article
Adams, J. - Chaloupka, Petr - Lednický, Richard - Šumbera, Michal
phi meson production in Au + Au and p + p collisions at root S-NN=200 GeV.
[Produkce mezonů phi ve srážkách Au+Au a p+p při root S-NN=200 GeV.]
Physics Letters. B. Roč. 612, 3-4 (2005), s. 181-189. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR GA202/04/0793
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z10100502
Keywords : phi mezon * Au+Au * p+p
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 5.301, year: 2005

We report the STAR measurement of phi meson production in Au + Au and p + p collisions at root s(NN) = 200 GeV. Using the event mixing technique, the phi spectra and yields are obtained at mid-rapidity for five centrality bins in Au + Au collisions and for non-singly-diffractive p + p collisions. It is found that the phi transverse momentum distributions from Au + An 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 phi production in central An + An collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions ( N-bin). The systematics of p(t) versus centrality and the constant phi/K- ratio versus beam species, centrality, and collision energy rule out kaon coalescence as the dominant mechanism for phi production.

Produkce mezonů phi ve srážkách Au+Au a p+p při root S-NN=200 GeV.
Permanent Link: http://hdl.handle.net/11104/0161148