A study of mixing and indirect CP violation in D 0 mesons through the determination of the parameters y CP and A Γ is presented. The parameter y CP is the deviation from unity of the ratio of effective lifetimes measured in D 0 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 y CP = (5 . 5 ± 6 . 3 stat ± 4 . 1 syst ) × 10 −3 . The parameter A Γ is the asymmetry of effective lifetimes measured in decays of D 0 and mesons to K + K − . The result is A Γ = (−5 . 9 ± 5 . 9 stat ± 2 . 1 syst ) × 10 −3 . A data-driven technique is used to correct for lifetime-biasing effects.
Measurement of mixing and CP violation parameters in two-body charm decays
R. Cardinale;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2012-01-01
Abstract
A study of mixing and indirect CP violation in D 0 mesons through the determination of the parameters y CP and A Γ is presented. The parameter y CP is the deviation from unity of the ratio of effective lifetimes measured in D 0 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 y CP = (5 . 5 ± 6 . 3 stat ± 4 . 1 syst ) × 10 −3 . The parameter A Γ is the asymmetry of effective lifetimes measured in decays of D 0 and mesons to K + K − . The result is A Γ = (−5 . 9 ± 5 . 9 stat ± 2 . 1 syst ) × 10 −3 . A data-driven technique is used to correct for lifetime-biasing effects.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.