Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-08-16
Nucl.Phys. A715 (2003) 665-668
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk at Quark Matter'02, 4 pages incl. 5 eps-figures
Scientific paper
10.1016/S0375-9474(02)01461-6
The production of phi mesons in Au+Au collisions at RHIC and their propagation in a hot and dense nuclear medium is studied within the microscopic quark-gluon string model. The inverse slope parameter of the transverse mass distribution agrees well with that extracted from the STAR data, while the absolute yield of phi is underestimated by a factor 2. It appears that the fusion of strings alone cannot increase the phi yield either. Less than 30% of detectable phi's experience elastic scattering, this rate is insufficient for the full thermalization of phi. The directed flow of phi at |y|<2 demonstrates strong antiflow behavior, whereas its elliptic flow rises up to about 3.5% in the same rapidity interval. As a function of transverse momentum it rises linearly with increasing p_t, in agreement with the STAR data, and saturates at p_t > 2 GeV/c.
Bravina Larissa
Csernai Laszlo
Faessler Amand
Fuchs Ch.
Panitkin S.
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