Improved measurement of the CKM angle gamma in B^-+ -> D^(*) K^(*)-+ decays with a Dalitz plot analysis of D decays to K_S^0 pi^+ pi^- and K_S^0 K^+ K^-

Abstract

We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa {\it CP}-violating phase $\gamma$ through a Dalitz plot analysis of neutral $D$ meson decays to $K_S^0{\pi }^{+}{\pi }^{-}$ and $K_S^0{K}^{+}{K}^{-}$ 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 a sample of 383 million $B\bar{B}$ pairs collected by the BABAR detector, we measure $\gamma =(76\pm 22\pm 5\pm 5{)}^{\circ }$ (mod $180^{\circ }$), where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding two standard deviation region is $29^{\circ }<\gamma <122^{\circ }$. This result has a significance of direct {\it CP} violation ($\gamma \ne 0$) of 3.0 standard deviations.

22 pages, 13 figures, 6 tables. Accepted by Phys. Rev. D

References in corpus (8)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Evidence for D0-anti-D0 Mixing
• Measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays
• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• Dalitz plot analysis of the D+ to K-pi+pi+ decay in the FOCUS experiment
• CP violation and the CKM matrix
• CP violation and limits on New Physics including recent $B_s$ measurements
• Measurement of the B- -> D0 K*- branching fraction

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