1302.5873 (Guo-Liang Ma)

Towards detailed tomography of high energy heavy-ion collisions by
$γ$-jet    [PDF]

Guo-Liang Ma

Within a multi-phase transport (AMPT) model with string melting scenario, the transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Jet losses its energy from by $\sim$15% in central collisions to by $\sim$ 5% in peripheral collisions due to strong interactions between jet and partonic matter, which is much higher than those from hadronic interactions only. The final hadronic interactions have little influence on the imbalance. The imbalance ratio, $x_{j\gamma}$, is very sensitive to both production position and passing direction of $\gamma$-jet, which enables a detail $\gamma$-jet tomographic study on the formed partonic matter by selecting different $x_{j\gamma}$ ranges experimentally. It is proposed that $\gamma$-hadron azimuthal correlation associated with $\gamma$+jet is a good probe to see the medium response to different $\gamma$-jet production configurations.

View original: http://arxiv.org/abs/1302.5873