We present measurements of the branching fractions and charge asymmetries of B decays to all D(*)D̄(*) modes. Using 232×106 BB̄ pairs recorded on the Υ(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 B(B0→D*+D*-)=(8.1±0. 6±1.0)×10-4, B(B0→D*±D)=(5.7±0.7±0. 7)×10-4, B(B0→D+D-)=(2.8±0.4±0.5)×10-4, B(B+→D*+D̄*0)=(8.1±1.2±1.2)×10-4, B(B+→D*+D̄0)=(3.6±0.5±0.4)×10-4, B(B+→D+D̄*0)=(6.3±1.4±1.0)×10-4, and B(B+→D+D̄0)=(3.8±0.6±0.5)×10-4, where in each case the first uncertainty is statistical and the second systematic. We also determine the limits B(B0→D*0D̄*0)<0.9×10-4, B(B0→D*0D̄0)<2.9×10-4, and B(B0→D0D̄0)<0. 6×10-4, 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*+D̄*0)=-0.15±0.11±0.02, A(B+→D*+D̄0)=-0.06±0.13±0.02, A(B+→D+D̄ *0)=0.13±0.18±0.04, and A(B+→D+D̄0)=-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(*)D̄(*) modes, we find the Cabibbo-Kobayashi-Maskawa phase γ is favored to lie in the range (0.07-2.77) radians (with a +0 or +π radians ambiguity) at 68% confidence level.

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Measurement of branching fractions and CP-violating charge asymmetries for B-meson decays to D(*)D̄(*), and implications for the Cabibbo-Kobayashi-Maskawa angle γ. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 73(11) [10.1103/PhysRevD.73.112004].

Measurement of branching fractions and CP-violating charge asymmetries for B-meson decays to D(*)D̄(*), and implications for the Cabibbo-Kobayashi-Maskawa angle γ

CARPINELLI, Massimo;
2006

Abstract

We present measurements of the branching fractions and charge asymmetries of B decays to all D(*)D̄(*) modes. Using 232×106 BB̄ pairs recorded on the Υ(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 B(B0→D*+D*-)=(8.1±0. 6±1.0)×10-4, B(B0→D*±D)=(5.7±0.7±0. 7)×10-4, B(B0→D+D-)=(2.8±0.4±0.5)×10-4, B(B+→D*+D̄*0)=(8.1±1.2±1.2)×10-4, B(B+→D*+D̄0)=(3.6±0.5±0.4)×10-4, B(B+→D+D̄*0)=(6.3±1.4±1.0)×10-4, and B(B+→D+D̄0)=(3.8±0.6±0.5)×10-4, where in each case the first uncertainty is statistical and the second systematic. We also determine the limits B(B0→D*0D̄*0)<0.9×10-4, B(B0→D*0D̄0)<2.9×10-4, and B(B0→D0D̄0)<0. 6×10-4, 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*+D̄*0)=-0.15±0.11±0.02, A(B+→D*+D̄0)=-0.06±0.13±0.02, A(B+→D+D̄ *0)=0.13±0.18±0.04, and A(B+→D+D̄0)=-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(*)D̄(*) modes, we find the Cabibbo-Kobayashi-Maskawa phase γ is favored to lie in the range (0.07-2.77) radians (with a +0 or +π radians ambiguity) at 68% confidence level.
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Measurement of branching fractions and CP-violating charge asymmetries for B-meson decays to D(*)D̄(*), and implications for the Cabibbo-Kobayashi-Maskawa angle γ. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 73(11) [10.1103/PhysRevD.73.112004].
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