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The heavy quarks are produced in initial hard interactions in heavy ion collisions. These heavy quarks loose energy while traversing through the collective partonic mediuum formed after the collisions which is reflected in the nuclear modification factor RAA. The quarks loose energy either due to the collisions with the partons or by the radiating a gluon or both. There are several formulations to calculate collisional as well as radiative energy loss which are employed to calculate the RAA. The RAA also contains other effects such as nuclear shadowing which must be taken into account in addition to energy loss. In this paper, we calculate the radiative energy loss of heavy quarks (both charm or bottom) using reaction operator formalism [1–3] (DGLV) and using and generalized dead cone approach AJMS [4]. The nuclear modification factor RAA including shadowing and energy loss is evaluated for B and D and are compared with the measurements in Pb-Pb collision at √ sNN = 2.76 TeV.

Constraining Heavy Quark Energy Loss Using B and D Mesons in Heavy Ion Collision.