Search for b→u transitions in B-→[K+π-π0]DK-
Abstract
We search for decays of a B meson into a neutral D meson and a charged kaon, with the D meson decaying into a charged kaon, a charged pion, and a neutral pion. This final state can be reached through the b→c transition B-→D0K- followed by the doubly Cabibbo-suppressed D0→K+π-π0, or the b→u transition B-→D¯0K- followed by the Cabibbo-favored D¯0→K+π-π0. The interference of these two amplitudes is sensitive to the angle γ of the unitarity triangle. We present results based on 226×106 e+e-→Υ(4S)→BB¯ events collected with the BABAR detector at SLAC. We find no significant evidence for these decays and we set a limit RADS≡(Γ([K+π-π0]DK-)+Γ([K-π+π0]DK+))/(Γ([K+π-π0]DK+)+Γ([K-π+π0]DK-))<0.039 at 95% confidence level, which we translate with a Bayesian approach into rB≡|A(B-→D¯0K-)/A(B-→D0K-)|<0.19 at 95% confidence level.
- Publication:
-
Physical Review D
- Pub Date:
- December 2007
- DOI:
- 10.1103/PhysRevD.76.111101
- arXiv:
- arXiv:0708.0182
- Bibcode:
- 2007PhRvD..76k1101A
- Keywords:
-
- 13.25.Hw;
- 14.40.Nd;
- Decays of bottom mesons;
- Bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- 4 pages, 10 postscript figues, submitted to Physical Review Letters