  The flavor dependence of jet quenching is a powerful handle to discriminate
between models of parton energy loss in heavy-ion collisions. We demonstrate
the capacity of CMS to identify jets initiated by bottom quarks using displaced
vertices reconstructed in the silicon tracking system. The b-jet to inclusive
jet ratio is measured in PbPb collisions and compared to pp collisions and
simulations at the same center-of-mass energy.
