2006/07/26 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0607065
15 pages, 10 postscript figues, submitted to ICHEP2006
arxiv created 2006/07/26 · openalex publication_date 2006/07/26 · arxiv updated 2009/12/01 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
We search for decays of a B meson into a neutral D meson and a kaon, with the D meson decaying into K+pi-pi0. This final state can be reached through the b --> c transition B- -> D0K- followed by the doubly Cabibbo-suppressed D0 --> K+pi-pi0, or the b --> u transition B- --> D0bar K- followed by the Cabibbo-favored D0bar --> K+ pi-pi0. The interference of these two amplitudes is sensitive to the angle gamma of the unitarity triangle. We present preliminary results based on 226 106 e+e- --> Y(4s) --> BBbar events collected with the BABAR detector at SLAC. We find no significant evidence for these decays and we set a limit RADS =(BR(B- -->[K+pi-pi0]D K-)+ BR(B- --> [K-pi+pi0]D K+))/(BR(B- -->[K-pi+pi0]D K-)+ BR(B- --> [K+pi-pi0]D K+))<0.039 at 95% confidence level, which we translate with a Bayesian approach into rB = |A(B- --> D0bar K-)|/|A(B- --> D0bar K-)| < 0.185 at 95% confidence level.