Improved measurement of CP observables in B- --> D0_{CP} K- decays

Abstract

We present a study of the decay B- -> D0_CP K- and its charge conjugate, where D0_CP is reconstructed in both a non-CP flavor eigenstate and in CP (CP-even and CP-odd) eigenstates, based on a sample of 382 million Y(4S) -> BBbar decays collected with the BABAR detector at the PEP-II e+e- storage ring. We measure the direct CP asymmetries A_CP\pm and the ratios of the branching fractions R_CP\pm: A_CP+ = 0.27\pm 0.09(stat)\pm 0.04(syst), A_CP- =-0.09\pm 0.09(stat)\pm 0.02(syst), R_CP+ = 1.06\pm 0.10(stat)\pm 0.05(syst), R_CP- = 1.03\pm 0.10(stat)\pm 0.05(syst). We also express the results in terms of the so called Cartesian coordinates x+, x-, and r^2: x+ = -0.09\pm 0.05(stat)\pm 0.02(syst)}, x- = 0.10\pm 0.05(stat)\pm 0.03(syst)}, r^2 = 0.05\pm 0.07(stat)\pm 0.03(syst)}. These results will help to better constrain the phase parameter $\gamma =\arg (-V_{ud}{V}_{ub}^{\ast }/V_{cd}{V}_{cb}^{\ast })$ of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

8 pages, 3 postscript figures

References in corpus (6)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• Study of B+- --> D_CP K+- and D^*_CP K+- decays
• Measurements of the branching fractions and CP-asymmetries of B- --> D0_(CP) K- decays
• Search for b--> u transitions in B- -> [K+pi-pi0]_D K-

Cited by in corpus (10)

• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• Exploring the resonances $X(4140)$ and $X(4274)$ through their decay channels
• Measurements of branching fraction ratios and CP asymmetries in B+/- ->D_CP K+/- decays in hadron collisions
• B Meson Decays
• A Method to Measure cos(2beta) Using Time-Dependent Dalitz Plot Analysis of B0 -> D_CP pi+ pi-
• Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of B -> D*K Decays
• Measurement of CP violation observables and parameters for the decays $B^{\pm }\to D{K}^{\ast \pm }$
• Measurements of gamma/phi_3 at B factories
• CP parameters of the B systems from Tevatron
• Hadronic B Decays at BABAR and BELLE