Evidence for direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa 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 $B^{\mp }\to D{K}^{\mp }$, $B^{\mp }\to D^{\ast }{K}^{\mp }$ with $D^{\ast }\to D{\pi }^0,D\gamma$, and $B^{\mp }\to D{K}^{\ast \mp }$ with $K^{\ast \mp }\to K_S^0{\pi }^{\mp }$, 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.

7 pages, 2 postscript figures, 2 tables, appendix with 4 pages containing supplementary material, submitted to Phys. Rev. Lett

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• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• CP violation and limits on New Physics including recent $B_s$ measurements
• Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-

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