1210.6610 (Guang-You Qin)
Guang-You Qin
We study the medium modification of jets correlated with large transverse momentum photons at the LHC via a Monte-Carlo transport model which incorporates both elastic collisions and radiative energy loss experienced by the parton showers. Numerical results are presented for the modification of tagged jet yield, the photon-jet momentum imbalance, and their azimuth separation distribution. The use of photon-jet correlations as jet quenching tomography tools is addressed by studying the photon-jet events with different values of $x_T = p_{T,J}/p_{T,\gamma}$. It is found that larger $x_T$ jets are mainly produced from the surface of the medium, while smaller $x_T$ jets are from those jets which have traversed longer distance of medium. Combined with the momentum spectrum of the photon-tagged jets, this leads to stronger suppression and centrality dependence for larger $x_T$ jets, and weaker suppression (or enhancement) for smaller $x_T$ jets.
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http://arxiv.org/abs/1210.6610
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