Thursday, April 11, 2013

1304.2841 (Guo-Liang Ma)

Di-jet asymmetry in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76
TeV with a multiphase transport model

Guo-Liang Ma
Within a multi-phase transport (AMPT) model, di-jet asymmetry is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. It has been found that a large di-jet asymmetry ($A_{J}$) is produced by strong interactions between jets and partonic matter rather than by hadronic interactions only, since jets loss much more energy via partonic interactions than with hadronic interactions. It is demonstrated that the final hadronic processes such as hadronization and hadronic rescatterings have little effects on the di-jet asymmetry owning to jet partonic energy loss. The asymmetry evolution function, final $A_{J}$ as a function of initial $A_{J}$ and jet energy loss, discloses that final di-jet asymmetry is driven by both initial di-jet asymmetry and partonic jet energy loss, which is consistent with an increasing jet energy loss in a hot and strongly interacting partonic medium in more central Pb+Pb collisions.
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