Abstract
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.
| Original language | English |
|---|---|
| Article number | 051103 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 82 |
| Issue number | 5 |
| DOIs | |
| State | Published - 28 Sep 2010 |
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