We present improved measurements of the branching fractions for the decays B0→Ds+π- and B̄0→Ds+K- using a data sample of 657×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e- collider. The results are B(B0→Ds+π -)=(1.99±0.26±0.18)×10-5 and B(B ̄0→Ds+K-)=(1.91±0.24±0.17) ×10-5, where the uncertainties are statistical and systematic, respectively. Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0→D+π- and the Cabibbo favored decay B0→D-π+, R Dπ=[1.71±0.11(stat)±0.09(syst)±0.02(theo)]%, where the last term denotes the theory error.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2010 Sept 28|
Bibliographical noteFunding Information:
The authors thank Beate Ritz (UCLA) and Ralph Delfino (UCI) for helping start the study and validate air pollution exposure models. The authors also thank the Health Information and Research Section/California Department of Public Health for providing birth certificates data and Harry Mangalam, Adam Brenner and Joseph A. Farran from the High Performance Cluster team at UCI for their technical support. The study was supported by the Health Effect Institute (HEI 4787-RFA09-4110-3WU). HEI had no role in the study design, in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the article for publication.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)