Improved measurements of branching fractions and CP partial rate asymmetries for $B\toωK$ and $B\toωπ$

by C. -M. Jen; P. Chang; K. Abe; I. Adachi; H. Aihara

doi:10.1103/PhysRevD.74.111101

paper

Improved measurements of branching fractions and CP partial rate asymmetries for $B \to ω K$ and $B \to ω π$

arXiv:hep-ex/0609022 · doi:10.1103/PhysRevD.74.111101

Abstract

We report improved measurements of $B$ to pseudoscalar-vector decays containing an $ω$ meson in the final states. Our results are obtained from a data sample that contains $388 \times 1 0^{6}$ $B B ˉ$ pairs accumulated at the $Υ (4 S)$ resonance, with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We measure the following branching fractions: $B (B^{+} \to ω K^{+}) = [8.1 \pm 0.6 (stat.) \pm 0.6 (syst.)] \times 1 0^{- 6}$ , $B (B^{+} \to ω π^{+}) = [6.9 \pm 0.6 (stat.) \pm 0.5 (syst.)] \times 1 0^{- 6}$ , and $B (B^{0} \to ω K^{0}) = [4. 4_{- 0.7}^{+ 0.8} (stat.) \pm 0.4 (syst.)] \times 1 0^{- 6} .$ The partial width ratio $\frac{Γ ( B ^{+} \to ω K ^{+} )}{Γ ( B ^{0} \to ω K ^{0} )}$ = $1.8 \pm 0.4 (stat.) \pm 0.1 (sys.)$ . We also set the 90% confidence level upper limit $B (B^{0} \to ω π^{0}) < 2.0 \times 1 0^{- 6} .$ In addition, we obtain the partial rate asymmetries $A_{C P} = 0.0 5_{- 0.07}^{+ 0.08} (stat.) \pm 0.01 (syst.)$ for $B^{+} \to ω K^{+}$ , and $A_{C P} = - 0.02 \pm 0.09 (stat.) \pm 0.01 (syst.)$ for $B^{+} \to ω π^{+}$ .

6 pages, 2 figures, 2 tables, accepted by PRD(RC)

Improved measurements of branching fractions and CP partial rate asymmetries for $B \to ω K$ and $B \to ω π$

Abstract

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Improved measurements of branching fractions and CP partial rate asymmetries for B→ωK and B→ωπ

Abstract

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Cited by in corpus (8)

Improved measurements of branching fractions and CP partial rate asymmetries for $B \to ω K$ and $B \to ω π$