Variation of jet quenching from RHIC to LHC and thermal suppression of QCD coupling constant
B. G. Zakharov
L.D. Landau Institute for Theoretical Physics
117334 Moscow, Russia
We perform a joint jet tomographic analysis of the data on the
nuclear modification factor RAA from PHENIX at RHIC and ALICE at LHC.
The computations are performed accounting for radiative and collisional
parton energy loss with running coupling constant.
Our results show that the observed slow variation of RAA from RHIC to LHC
indicates that the QCD coupling constant is suppressed
in the quark-gluon plasma produced at LHC.