We present a measurement of D0-D̄0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D* +→D0π+, where D0 decays to Kâπ ±, K-K+, or π -π+, along with the untagged decays D0→K âπ± and D0→K-K +. The lifetimes of the CP-even, Cabibbo-suppressed modes K -K+ and π-π+ are compared to that of the CP-mixed mode Kâπ± in order to measure yCP and ΔY. We obtain yCP=[0.72±0. 18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0. 06(syst)]%, where ΔY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468 fb-1 collected with the BABAR detector at the PEP-II asymmetric-energy e+e - collider.
Lees, J., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2013). Measurement of D-0-(D)over-bar(0) mixing and CP violation in two-body D-0 decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 87(1) [10.1103/PhysRevD.87.012004].
Measurement of D-0-(D)over-bar(0) mixing and CP violation in two-body D-0 decays
CARPINELLI, MassimoMembro del Collaboration Group
;
2013
Abstract
We present a measurement of D0-D̄0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D* +→D0π+, where D0 decays to Kâπ ±, K-K+, or π -π+, along with the untagged decays D0→K âπ± and D0→K-K +. The lifetimes of the CP-even, Cabibbo-suppressed modes K -K+ and π-π+ are compared to that of the CP-mixed mode Kâπ± in order to measure yCP and ΔY. We obtain yCP=[0.72±0. 18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0. 06(syst)]%, where ΔY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468 fb-1 collected with the BABAR detector at the PEP-II asymmetric-energy e+e - collider.
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