Measurement of Branching Fractions and CP-Violating Charge Asymmetries for B Meson Decays to D(*)D(*), and Implications for the CKM Angle gamma

Abstract

We present measurements of the branching fractions and charge asymmetries of B decays to all D(*)D(*) modes. Using 232 million BBbar pairs recorded on the Upsilon(4S) resonance by the BaBar detector at the e+e- asymmetric B factory PEP-II at the Stanford Linear Accelerator Center, we measure the branching fractions BF(B0 -> D*+D*-) = (8.1 +- 0.6 +- 1.0) x 10^-4, BF(B0 -> D*+-D-+) = (5.7 +- 0.7 +- 0.7) x 10^-4, BF(B0 -> D+D-) = (2.8 +- 0.4 +- 0.5) x 10^-4, BF(B+ -> D*+D*0) = (8.1 +- 1.2 +- 1.2) x 10^-4, BF(B+ -> D*+D0) = (3.6 +- 0.5 +- 0.4) x 10^-4, BF(B+ -> D+D*0) = (6.3 +- 1.4 +- 1.0) x 10^-4, and BF(B+ -> D+D0) = (3.8 +- 0.6 +- 0.5) x 10^-4, where in each case the first uncertainty is statistical and the second systematic. We also determine the limits BF(B0 -> D*0D*0) < 0.9 x 10^-4, BF(B0 -> D*0D0) < 2.9 x 10^-4, and BF(B0 -> D0D0) < 0.6 x 10^-4, each at 90% confidence level. All decays above denote either member of a charge conjugate pair. We also determine the CP-violating charge asymmetries A(B0 -> D*+-D-+) = 0.03 +- 0.10 +- 0.02, A(B+ -> D*+D*0) = -0.15 +- 0.11 +- 0.02, A(B+ -> D*+D0) = -0.06 +- 0.13 +- 0.02, A(B+ -> D*+D*0) = 0.13 +- 0.18 +- 0.04, and A(B+ -> D+D0) = -0.13 +- 0.14 +- 0.02. Additionally, when we combine these results with information from time-dependent CP asymmetries in B0 -> D*+D*- decays and world-averaged branching fractions of B decays to Ds(*)D(*) modes, we find the CKM phase gamma is favored to lie in the range [0.07-2.77] radians (with a +0 or +pi radians ambiguity) at 68% confidence level.

23 pages, 6 postscript figues, submitted to Phys. Rev. D

Cited by in corpus (23)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Charged $B$ Mesogenesis
• Measurement of CP-Violating Asymmetries in B0->D(*)+D-
• Exploring CP Violation and Penguin Effects through $B_d^0\to D^{+}{D}^{-}$ and $B_s^0\to D_s^{+}{D}_s^{-}$
• Evidence for CP Violation in B0 -> D+D- Decays
• Decays of $B$ meson to two charmed mesons
• Standard Model Predictions and New Physics Sensitivity in B->DD Decays
• Measurements of time-dependent CP asymmetries in B0 --> D(*)+D(*)- decays
• CP violation and limits on New Physics including recent $B_s$ measurements
• Measurement of the Semileptonic Decays B --> D tau- nubar_tau and B --> D* tau- nubar_tau
• Small amplitude effects in $B^0\to D^{+}{D}^{-}$ and related decays
• Measurement of the branching fraction and charge asymmetry of the decay B+ -> D+ D0bar and search for B0 -> D0 D0bar
• Improved Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay B0->D*+D*-
• Studying Double Charm Decays of B_{u,d} and B_{s} Mesons in the MSSM with R-parity Violation
• The double charm decays of B Mesons in the mSUGRA model
• First observation of CP violation and improved measurement of the branching fraction and polarization of B0 -> D*+ D*- decays
• Observation of the $B_s^0\to D^{\ast \pm }{D}^{\mp }$ decay
• D0-anti-D0 Mixing and CP Violation in D0 vs anti-D0 to K*(+-) K(-+) Decays
• Study of Pure Annihilation Decays B_{d,s} \to D^{0} \bar D^{0}
• Nondecoupling of Heavy Fermions and a Special Yukawa Texture
• Status of |Vub|, |Vcb| and their relative phase