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Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D(*)K(*)± decays
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We report the determination of the Cabibbo-Kobayashi-Maskawa C P -violating angle γ through the combination of various measurements involving B ± → D K ± , B ± → D ∗ K ± , and B ± → D K * ± decays performed by the BABAR experiment at the PEP-II e + e − collider at SLAC National Accelerator Laboratory. Using up to 474 million B ¯¯¯ B pairs, we obtain γ = ( 69 + 17 − 16 ) ° 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.
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D(*)K(*)± decays. Physical Review D. 2013. Vol. 87, num. 5, pags. 052015. ISSN 1550-7998. [consulted: 8 of August of 2026]. Available at: https://hdl.handle.net/2445/131827