HAL : in2p3-00023325, version 1
 arXiv : nucl-ex/0406003
 Physics Letters B 612 (2005) 181-189
 $\phi$ meson production in Au+Au and p+p collisions at $\sqrt{s_{NN}}$= 200 GeV
 STAR Collaboration(s)
 (2005)
 We report the STAR measurement of Phi meson production in Au+Au and p+p collisions at sqrt (s)=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+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 Phi production in central Au+Au collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions. The systematics of 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/nucl-ex/0406003
 in2p3-00023325, version 1 http://hal.in2p3.fr/in2p3-00023325 oai:hal.in2p3.fr:in2p3-00023325 Contributeur : Yvette Heyd <> Soumis le : Lundi 22 Novembre 2004, 09:18:00 Dernière modification le : Jeudi 10 Mai 2007, 15:48:50