Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-04-30
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 5 figures, Talk presented at the Session-conference of the Russian Academy of Sciences, Physics of Fundamental Intera
Scientific paper
The production of hadrons in heavy ions collisions at high $p_T$ provides an important information on mechanism of particle formation and constituent energy loss in medium. Such information is needed for search of a Critical Point and signatures of phase transition. Measurements by the STAR Collaboration of charged hadron production in Au+Au collisions at $\sqrt {s_{NN}}$=9.2 GeV over a wide transverse momentum $p_T=0.2-4.$ GeV/c and at mid-rapidity range are reported. It allows for a first measurement of the spectra for charged hadrons at high $p_T$ at this energy. The spectra demonstrate the dependence on centrality which enhances with $p_T$. The constituent energy loss and its dependence on transverse momentum of particle, and centrality of collisions are estimated in the $z$-scaling approach.
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