  We extend our recently advanced model on collisional energy loss of heavy
quarks in a quark gluon plasma (QGP) by including radiative energy loss. We
discuss the approach and present calculations for PbPb collisions at
$\sqrt{s}=2.76 TeV$. The transverse momentum spectra, RAA, and the elliptic
flow $v_2$ of heavy quarks have been obtained using the model of Kolb and Heinz
for the hydrodynamical expansion of the plasma.
