Measurement of mixing and CP violation parameters in two-body charm decays

Abstract

A study of mixing and indirect CP violation in D0 mesons through the determination of the parameters yCP and AΓ is presented. The parameter yCP is the deviation from unity of the ratio of effective lifetimes measured in D0 decays to the CP eigenstate K+K- with respect to decays to the Cabibbo favoured mode K-π+. The result measured using data collected by LHCb in 2010, corresponding to an integrated luminosity of 29 pb-1, is yCP = (5.5 ± 6.3stat ± 4.1syst) × 10 -3. The parameter AΓ is the asymmetry of effective lifetimes measured in decays of D0 and D̄0 mesons to K+K-. The result is AΓ = (-5.9 ± 5.9stat ± 2.1syst) × 10-3. A data-driven technique is used to correct for lifetime-biasing effects. Copyright CERN.