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

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

2011-12-20

arxiv.org/abs/1112.4698v1

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to JHEP

Scientific paper

A study of mixing and indirect CP violation in D0 mesons through the determination of the parameters y_CP and A_\Gamma\ is presented. The parameter y_CP 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-\pi+. 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}) x 10^-3. The parameter A_\Gamma\ is the asymmetry of effective lifetimes measured in decays of D0 and anti-D0 mesons to K+K-. The result is A_\Gamma\ = (-5.9+/-5.9_{stat}+/-2.1_{syst}) x 10^-3. A data-driven technique is used to correct for lifetime-biasing effects.

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