We report the determination of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through the combination of various measurements involving B ±→DK±, B±→D *K±, and B±→DK *± decays performed by the BABAR experiment at the PEP-II e+e- collider at SLAC National Accelerator Laboratory. Using up to 474 million BB̄ pairs, we obtain γ=(69-16+17) modulo 180. The total uncertainty is dominated by the statistical component, with the experimental and amplitude-model systematic uncertainties amounting to ±4. The corresponding two-standard-deviation region is 41 <102. This result is inconsistent with γ=0 with a significance of 5.9 standard deviations.
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2013). Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D (*)K(*)± decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 87(5) [10.1103/PhysRevD.87.052015].
Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D (*)K(*)± decays
CARPINELLI, MassimoMembro del Collaboration Group
;
2013
Abstract
We report the determination of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through the combination of various measurements involving B ±→DK±, B±→D *K±, and B±→DK *± decays performed by the BABAR experiment at the PEP-II e+e- collider at SLAC National Accelerator Laboratory. Using up to 474 million BB̄ pairs, we obtain γ=(69-16+17) modulo 180. The total uncertainty is dominated by the statistical component, with the experimental and amplitude-model systematic uncertainties amounting to ±4. The corresponding two-standard-deviation region is 41 <102. This result is inconsistent with γ=0 with a significance of 5.9 standard deviations.
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