Abstract
The nuclear modification factors RAA and RCP have been used to measure medium-induced suppression in heavy-ion collisions at = 200 GeV which was among the earliest evidence for the existence of a strongly interacting medium called a quark-gluon plasma (QGP). Nuclear modification factors for asymmetric collisions (RdA) have measured the Cronin Effect, an enhancement of high transverse momentum particle yields in deuteron-gold collisions relative to proton-proton collisions. A similar enhancement is observed in data presented in these proceedings and competes with the quenching caused by partonic energy loss in the QGP. In these proceedings we will present charged-hadron RCP at mid-rapidity for = 7.7 – 62.4 GeV as well as identified π+, K+, and p RCP. Comparisons to HIJING motivate possible methods for disentangling competing modifications to nuclear transverse momentum spectra.
Highlights
The RHIC beam energy scan (BES) is a program to collide Au+Au ions at various collision energies in order to explore the QCD phase diagram; searching for a possible critical point and for a phase boundary marked by the disappearance of key signatures for the formation of a QGP [1]
The motivation for running the simulator with jet quenching turned off was the expectation that at sufficiently low beam energies, where medium-induced jet quenching has minimal effect, there would be a quantitative agreement between the charged hadron RCP from simulation and data
Identified hadron RCP Particle yields were extracted from a simultaneous fit to dE/dx distributions measured in the STAR Time Projection Chamber and time of flight distributions measured in the STAR Time of Flight detector for each centrality and pT bin at each beam energy
Summary
The RHIC beam energy scan (BES) is a program to collide Au+Au ions at various collision energies in order to explore the QCD phase diagram; searching for a possible critical point and for a phase boundary marked by the disappearance of key signatures for the formation of a QGP [1]. Trigger efficiency, tracking efficiency, and acceptance corrected charged-hadron spectra from mid-rapidity Au+Au collisions at √sNN = 7.7, 11.5, 19.6, 27, 39, and 62.4 GeV were produced for 0-5% central and 60-80% peripheral collisions in the STAR detector. Taking the ratio of these scaled spectra for each energy gives the RCP(√sNN, pT) shown in Fig. 1 (left) along with STAR’s published 200 GeV result [2].
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