Abstract
High-p T photon–hadron correlations are studied within the next-to-leading order (NLO) perturbative QCD parton model with modified parton-jet fragmentation functions due to jet quenching in high-energy A+A collisions. In central A+A collisions, the away-side hadrons with large z T=p T /p T are controlled mainly by the surface emission of the gamma-jet events, while a small z T region will be volume emission bias. In other words, gamma jets for a small-z T region probe the dense matter deeper than those gamma jets for a large-z T region, so the small-z T gamma jets are found to be slightly more sensitive to the properties of the dense matter than the large-z T gamma jets.
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