High pT inclusive charged hadron spectra from Au+Au collisions at [formula omitted] GeV

Abstract

The STAR Collaboration presents new measurements of inclusive charged hadron distributions for p T < 12 GeV/c from Au+Au collisions at S N N = 200 . Charged hadron suppression at high p T is similar in shape and magnitude at all centralities to that observed previously at S N N = 130 for p T < 6 GeV/c. The ratio of spectra from central and peripheral Au+Au collisions shows that hadron suppression is approximately constant within 6 < p T < 12 GeV/c. The ratios of charged hadron spectra at the two beam energies show a 15–20% increase in yield at low p T . At high p T , the ratios show a larger increase that agrees well with pQCD calculations of the S N N dependence of particle production in Au+Au collisions.