# Evidence for direct CP violation in the measurement of the CKM angle gamma with B-+ --> D(*) K(*)-+ decays

Abstract : We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle $\gamma$ through a Dalitz plot analysis of neutral $D$ meson decays to $K_S^0 \pi^+ \pi^-$ and $K_S^0 K^+ K^-$ produced in the processes $B^\mp \to D K^\mp$, $B^\mp \to D^{*} K^\mp$ with $D^* \to D \pi^0,D \gamma$, and $B^\mp \to D K^{*\mp}$ with $K^{*\mp} \to K_S^0 \pi^\mp$, using 468 million $B\bar{B}$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $e^+e^-$ collider at SLAC. We measure $\gamma=(68 \pm 14 \pm 4 \pm 3)^\circ$ ({\rm mod $180^\circ$}), where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the uncertainty in the description of the neutral $D$ decay amplitudes. This result is inconsistent with $\gamma = 0$ (no direct CP violation) with a significance of 3.5 standard deviations.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00487037
Contributor : Claudine Bombar <>
Submitted on : Thursday, May 27, 2010 - 5:13:56 PM
Last modification on : Tuesday, December 22, 2020 - 12:40:02 PM

### Citation

P. del Amo Sanchez, J.P. Lees, V. Poireau, E. Prencipe, V. Tisserand, et al.. Evidence for direct CP violation in the measurement of the CKM angle gamma with B-+ --> D(*) K(*)-+ decays. Physical Review Letters, American Physical Society, 2010, 105, pp.121801. ⟨10.1103/PhysRevLett.105.121801⟩. ⟨in2p3-00487037⟩

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