We report results from an updated study of the suppressed decays B-→DK- and B-→D*K- followed by D→K+π-, where D(*) indicates a D(*)0 or a D̄(*)0 meson, and D*→Dπ0 or D*→Dγ. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ due to interference between the b→c transition B-→D(*)0K- followed by the doubly Cabibbo-suppressed decay D0→K+π-, and the b→u transition B-→D̄(*)0K- followed by the Cabibbo-favored decay D̄0→K+π-. We also report an analysis of the decay B-→D(*)π- with the D decaying into the doubly Cabibbo-suppressed mode D→K+π-. Our results are based on 467×106 Υ(4S) →BB̄ decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+π-]DK-/π-) to favored ([K-π+]DK-/π-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B-→DK- and B-→DDπ0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: R DK=(1.1±0.6±0.2)×10-2,ADK=-0. 86±0.47-0.16+0.12, R(Dπ0)K*=(1.8±0.9±0.4) ×10-2,A(Dπ0)K*=+0.77±0.35±0.12,R(Dγ)K*= (1.3±1.4±0.8)×10-2,A(Dγ)K*=+0.36±0.94-0. 41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB|A(B-→D̄0K-)/A(B-→D0K-)|=(9.5-4.1+5.1)%, with r B<16.7% at 90% confidence level. In the case of B-→D*K- we find rB*|A(B-→D̄*0K-)/A(B-→D*0K-)|=(9.6-5. 1+3.5)%, with rB*<15.0% at 90% confidence level.

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Search for b→u transitions in B-→DK- and D*K- decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(7) [10.1103/PhysRevD.82.072006].

Search for b→u transitions in B-→DK- and D*K- decays

CARPINELLI, Massimo;
2010

Abstract

We report results from an updated study of the suppressed decays B-→DK- and B-→D*K- followed by D→K+π-, where D(*) indicates a D(*)0 or a D̄(*)0 meson, and D*→Dπ0 or D*→Dγ. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ due to interference between the b→c transition B-→D(*)0K- followed by the doubly Cabibbo-suppressed decay D0→K+π-, and the b→u transition B-→D̄(*)0K- followed by the Cabibbo-favored decay D̄0→K+π-. We also report an analysis of the decay B-→D(*)π- with the D decaying into the doubly Cabibbo-suppressed mode D→K+π-. Our results are based on 467×106 Υ(4S) →BB̄ decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+π-]DK-/π-) to favored ([K-π+]DK-/π-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B-→DK- and B-→DDπ0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: R DK=(1.1±0.6±0.2)×10-2,ADK=-0. 86±0.47-0.16+0.12, R(Dπ0)K*=(1.8±0.9±0.4) ×10-2,A(Dπ0)K*=+0.77±0.35±0.12,R(Dγ)K*= (1.3±1.4±0.8)×10-2,A(Dγ)K*=+0.36±0.94-0. 41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB|A(B-→D̄0K-)/A(B-→D0K-)|=(9.5-4.1+5.1)%, with r B<16.7% at 90% confidence level. In the case of B-→D*K- we find rB*|A(B-→D̄*0K-)/A(B-→D*0K-)|=(9.6-5. 1+3.5)%, with rB*<15.0% at 90% confidence level.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR detector
English
P. del Amo Sanchez et al. (The BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Search for b→u transitions in B-→DK- and D*K- decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(7) [10.1103/PhysRevD.82.072006].
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