Transverse momentum broadening of heavy quark and gluon energy loss in Sakai-Sugimoto model

In this paper, we calculate the transverse momentum diffusion coefficient κT of heavy quark and gluon penetration length in the deconfinement phase of Sakai-Sugimoto model, which is known as a holographic dual of large Nc QCD. We find that for the heavy quark moving through the thermal plasma with a constant velocity v < 1, the transverse momentum diffusion coefficient κT ∝ λγ 1 3 T /Td, and the gluon penetration length △x ∝ Ê 2 5 . These results are different from those calculated in N = 4 superYang-Mills theory, which are κT ∝ λγ 1 2 T 3 and △x ∝ Ê 1 3 , respectively. In the high energy limit, the difference between the two pairs of results should be evident, so we hope that the future LHC experiments can tell us which model is more closely related to the realistic strongly coupled QCD at finite temperature.