Measurement of the charm-mixing parameter yCP

The study of CP violation in charm mixing is of great interest, mainly after the recent observation of CP violation in neutral charm decays. A prospect for a measurement of y(CP) is presented, making use of the D-0 -> KK, D-0 -> pi pi and D-0 -> K pi decays, reconstructed in data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13TeV, corresponding to 6 fb(-1) of integrated luminosity. The D-0 mesons will be required to come from semimuonic B decays. The data analysis will be performed by dividing the dataset into exclusive D-0 decay-time bins, where the signal-yields ratios N(KK)/N(K pi) and N(pi pi)/N(K pi) will be extracted to measure y(CP). The analysis aims at improving the precision of about a factor of two compared to the previous LHCb measurement.