Identification of c-quark jets at the CMS experiment

An accurate identification of jets originating from {\rm b} quarks is of primary importance in many measurements and searches at the LHC. The development of a charm tagger, identifying jets initiated by charm jets, would be of similar importance. In this note a technique where an MVA--based discriminator is used in order to select charm jets is presented, together with its expected performance on simulations, and its calibration on W+c and top quark pairs. The datasets used for the calibration of the algorithm are from proton-proton collisions at 13 TeV, recorded by the CMS experiment during the first year of the LHC Run II.