Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of B -> D*K Decays

Abstract

We report a study of B -> D*K decays with D* decaying to D pi0 or D gamma, using 383 * 10**6 B Bbar pairs collected at the Upsilon(4S) resonance with the BaBar detector at the SLAC PEP-II B-Factory. The D meson decays under study include a non-CP mode (Kpi), CP-even modes (K+K-, pi^+pi^-) and CP-odd modes (KS pi0, KS phi, KS omega). We measure ratios (R*_{CP+-}) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries (A*_{CP+-}). These measurements are sensitive to the unitarity triangle angle gamma. We obtain A*_{CP+} = -0.11 pm 0.09 pm 0.01, R*_{CP+} = ~1.31 pm 0.13 pm 0.04, and A*_{CP-} = 0.06 pm 0.10 pm 0.02, R*_{CP-} = ~1.10 pm 0.12 pm 0.04, where the first error is statistical and the second error is systematic. Translating our results into an alternative parametrization, widely used for related measurements, we obtain x*_{+}=0.11 pm 0.06 pm 0.02 and x*_{-} = 0.00 pm 0.06 pm 0.02. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D -> K pi or in B -> D* pi decays.

12 pages, 2 postscript figures

References in corpus (21)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The BABAR Detector
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Evidence for D0-anti-D0 Mixing
• 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^-
• Improving bounds on $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm ,0}\to D{X}_s^{\pm ,0}$
• Measurement of the Cabibbo-Kobayashi-Maskawa angle gamma in B-+ -> D(*)K-+ decays with a Dalitz analysis of D -> K0s pi- pi+
• Observation of CP Violation in B0 -> K+pi- and B0 -> pi+pi-
• Nonleptonic Decays and Lifetimes of b-quark and c-quark Hadrons
• The Effect of $D-\bar{D}$ Mixing on the Measurement of $\gamma$ in $B\to DK$ Decays
• On ${\varphi }_3$ Measurements Using $B^{-}\to D^{\ast }{K}^{-}$ Decays
• Measurement of the B-->J/psi K^*(892) decay amplitudes
• Study of B+- --> D_CP K+- and D^*_CP K+- decays
• Observation of Cabibbo suppressed $B\to D^{(\ast )}{K}^{-}$ decays at Belle
• Measurement of the Ratio BR(B- --> D*0 K-)/BR(B- --> D*0 pi-) and of the CP Asymmetry of B- --> D*0(CP+) K- Decays
• Pathways to a clean gamma (phi3): From B to Super B-factories
• Measurement of CP Observables for the Decays B+/- --> D0_CP K*+/-
• Measurements of the branching fractions and CP-asymmetries of B- --> D0_(CP) K- decays
• Improved measurement of CP observables in B- --> D0_{CP} K- decays
• Implications of Bbar to D0 h0 Decays on Bbar to D Kbar, Dbar Kbar Decays

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