Measurement of the branching fractions for B-0 --> Ds*+pi- and B-0 --> Ds*-K+ decays - INSPIRE

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Measurement of the branching fractions for B-0 --> Ds+pi- and B-0 --> Ds-K+ decays

Belle

Collaboration

•

N.J. Joshi
(
- Tata Inst.
)

Dec, 2009

6 pages

Published in:

Phys.Rev.D 81 (2010) 031101

e-Print:

0912.2594 [hep-ex]

DOI:

10.1103/PhysRevD.81.031101

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}_{{{s}}}^{*+}}{{\mathit \pi}^{-}}

Report number:

BELLE-PREPRINT-2009-25,
KAK-PREPRINT-2009-33

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search15 citations

Citations per year

Abstract: (arXiv)

We present a study of

B^0 \to D_s^{*+}\pi^-

and

B^0 \to D_s^{*-}K^+

decays based on a sample of

657 \times 10^6

B\bar{B}

events collected with the Belle detector at the KEKB asymmetric-energy

e^+e^-

collider. We measure the branching fractions to be

\mathcal{B}(B^0 \to D_s^{*+} \pi^-) = (1.75 \pm 0.34 \pm 0.17 \pm 0.11) \times 10^{-5}

and

\mathcal{B}(B^0 \to D_s^{*-} K^+) = (2.02 \pm 0.33 \pm 0.18 \pm 0.13) \times 10^{-5}, with significances of 6.1 and 8.0 standard deviations, respectively. The first uncertainty is statistical, the second is due to the experimental systematics, and the third is from uncertainties in the

D_s^+

decay branching fractions. From our measurements, we obtain the most precise determination so far of

R_{D^*\pi}

, where

R_{D^*\pi}

is the ratio between amplitudes of the doubly Cabibbo-suppressed decay

B^0 \to D^{*+}\pi^-

and the Cabibbo favored

B^0 \to D^{*-}\pi^+$ decay.

Note:

6 pages, 2 figures, 2 tables. Submitted to PRD (RC)

12.15.Hh
11.30.Er
13.25.Hw
B0: hadronic decay
B0: branching ratio
electron positron: annihilation
B: pair production
BELLE
KEK-B
B0 --> D/s*(2110)+ pi-

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