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

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

2006-09-12

arxiv.org/abs/hep-ex/0609022v4

Phys.Rev.D74:111101,2006

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevD.74.111101

We report improved measurements of $B$ to pseudoscalar-vector decays containing an $\omega$ meson in the final states. Our results are obtained from a data sample that contains $388\times 10^{6}$ $B\bar{B}$ pairs accumulated at the $\Upsilon(4S)$ resonance, with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We measure the following branching fractions: ${\mathcal B}(B^{+} \to \omega K^{+}) = [8.1\pm0.6({\rm stat.})\pm{0.6}({\rm syst.})]\times 10^{-6}$, ${\mathcal B}(B^{+} \to \omega \pi^{+}) = [6.9\pm{0.6}({\rm stat.})\pm{0.5}({\rm syst.})]\times 10^{-6}$, and ${\mathcal B}(B^{0} \to \omega K^{0}) = [4.4^{+0.8}_{-0.7}({\rm stat.})\pm{0.4}({\rm syst.})]\times 10^{-6}.$ The partial width ratio $\frac{\Gamma (B^{+}\to \omega K^{+})}{\Gamma (B^{0}\to \omega K^{0})}$ = $1.8\pm0.4({\rm stat.})\pm0.1({\rm sys.})$. We also set the 90% confidence level upper limit ${\mathcal B}(B^{0} \to \omega \pi^{0}) < 2.0\times 10^{-6}.$ In addition, we obtain the partial rate asymmetries ${\mathcal A}_{CP} = 0.05^{+0.08}_{-0.07}(\rm {stat.}) \pm 0.01(\rm {syst.})$ for $B^{+} \to \omega K^{+}$, and ${\mathcal A}_{CP} = -0.02 \pm 0.09(\rm {stat.}) \pm 0.01(\rm {syst.})$ for $B^{+}\to \omega \pi^{+}$.

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