High p_T Correlations of γ and Charged Hadrons at RHIC

摘要

Prompt photon production in ultra-relativistic heavy-ion collisions provides a calibrated probe for the study of the properties of high energy density QCD matter. Especially interesting are the measurements of γ-tagged jets where the hard scattering scale is known and can be used to determine the partonic energy loss in the dense matter. We discuss the potential of γ-jet measurements at the Relativistic Heavy Ion Collider (RHIC) and argue that the observed suppression of the away-side correlations for di-jet production in central Au+Au collisions at (s_(NN))~(1/2) = 200 GeV should significantly reduce the backgrounds for the γ-jet coincidence measurements.