Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D(*)K(*)± decays
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 <γ<102. This result is inconsistent with γ=0 with a significance of 5.9 standard deviations. © 2013 American Physical Society.
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