Effect of thermalized charm on heavy quark energy loss
  The recent experimental results on the flow of $J/\psi$ at LHC show that ample amount of charm quarks is present in the quark gluon plasma and probably they are thermalized. In the current study we investigate the effect of thermalized charm quarks on the heavy quark energy loss to leading order in the QCD coupling constant. It is seen that the energy loss of charm quark increases due to the inclusion of thermal charm quarks. Running coupling has also been implemented to study heavy quark energy loss and we find a modest increase in the heavy quark energy loss due to heavy-heavy scattering at higher temperature to be realized at LHC energies. 
Souvik Priyam Adhya, Mahatsab Mandal, Sreemoyee Sarkar, Pradip K. Roy   and Sukalyan Chattopadhyay
hep-ph nucl-th