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Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays

Abstract : We report the determination of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma 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\bar{B} pairs, we obtain gamma = (69 ^{+17}_{-16})^\circ (modulo 180^\circ). The total uncertainty is dominated by the statistical component, with the experimental and amplitude-model systematic uncertainties amounting to +-4^\circ. The corresponding two-standard-deviation region is 41^\circ < gamma < 102^\circ. This result is inconsistent with gamma = 0 with a significance of 5.9 standard deviations.
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http://hal.in2p3.fr/in2p3-00780714
Contributor : Claudine Bombar <>
Submitted on : Thursday, January 24, 2013 - 4:23:24 PM
Last modification on : Wednesday, September 16, 2020 - 4:25:18 PM

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J. -P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, et al.. Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays. Physical Review D, American Physical Society, 2013, 87, pp.052015. ⟨10.1103/PhysRevD.87.052015⟩. ⟨in2p3-00780714⟩

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