Drag induced radiative energy loss of semi-hard heavy quarks

Abstract

We revisited gluon bremsstrahlung off a heavy quark in nuclear matter within higher twist formalism. In this work, we demonstrate that, in addition to transverse momentum diffusion parameter ($\hat{q}$), the gluon emission spectrum for a heavy quark is quite sensitive to $\hat{e}$, which quantify the amount of light-cone drag experienced by a parton. This effect leads to an additional energy loss term for heavy-quarks. From heavy flavor suppression data in ultra-relativistic heavy-ion collisions one can now estimate the value of this sub-leading non-perturbative jet transport parameter ($\hat{e}$) from our results.

Comments: Talk given at Hard Probes 2016, based on arXiv:1506.08648