High-pT spectra of charged hadrons in Au + Au collisions at √s_(NN) = 9.2 GeV in STAR

摘要

The production of hadrons in heavy-ion collisions at high-pT 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 √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.