Tomography of high-energy nuclear collisions with photon-hadron correlations

Abstract

Within the next-to-leading order (NLO) perturbative QCD (pQCD) parton model, suppression of away-side hadron spectra associated with a high $p_T$ photon due to parton energy loss is studied in high-energy heavy-ion collisions. Dictated by the shape of the $\gamma$-associated jet spectrum in NLO pQCD, hadron spectra at large $z_T=p_T^h/p_T^{\gamma }\stackrel{>}{\sim }1$ are more sensitive to parton energy loss and therefore are dominated by surface emission of $\gamma$-associated jets, whereas small $z_T$ hadrons mainly come from fragmentation of jets with reduced energy which is controlled by the volume emission. These lead to different centrality dependence of the $\gamma$-hadron suppression for different values of $z_T$. Therefore, a complete measurement of the suppression of $\gamma$-triggered hadron spectra, including its dependence on the orientation of the $\gamma$-hadron pair with respect to the reaction plane, allows the extraction of the spatial distribution of jet quenching parameters, achieving a true tomographic study of the quark-gluon plasma in high-energy heavy-ion collisions.

arXiv comment4 pages in ReVTeX, 4 figures

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