Heavy quark energy loss and heavy meson spectra in heavy ion collisions at LHC energies

The heavy ion collisions at RHIC and LHC energies are performed to study the creation and characterization of the Qurak Gluon Plasma (QGP). Heavy quarks are the best tools to study QGP. Due to their large mass, heavy quarks are mostly produced in early phase of collisions when parton momenta are very high before the formation of QGP and the production of heavy quarks is small making them special as a probe for QGP. While traversing the hot/dense medium formed in the collisions, these quarks loose energy due to the elastic collisions with the plasma constituents or by radiating gluon. There are several formulations to calculate the collision as well as radiative energy loss which are used to calculate the nuclear modification factor RAA