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Improved measurements of branching fractions and CP partial rate asymmetries for B--->omegaK and B--->omegapi

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Sep, 2006
6 pages
Published in:
  • Phys.Rev.D 74 (2006) 111101
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Abstract:
We report improved measurements of BB to pseudoscalar-vector decays containing an ω\omega meson in the final states. Our results are obtained from a data sample that contains 388×106388\times 10^{6} BBˉB\bar{B} pairs accumulated at the Υ(4S)\Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e−e^+ e^- collider. We measure the following branching fractions: B(B+→ωK+)=[8.1±0.6(stat.)±0.6(syst.)]×10−6{\mathcal B}(B^{+} \to \omega K^{+}) = [8.1\pm0.6({\rm stat.})\pm{0.6}({\rm syst.})]\times 10^{-6}, B(B+→ωπ+)=[6.9±0.6(stat.)±0.5(syst.)]×10−6{\mathcal B}(B^{+} \to \omega \pi^{+}) = [6.9\pm{0.6}({\rm stat.})\pm{0.5}({\rm syst.})]\times 10^{-6}, and B(B0→ωK0)=[4.4−0.7+0.8(stat.)±0.4(syst.)]×10−6.{\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 Γ(B+→ωK+)Γ(B0→ωK0)\frac{\Gamma (B^{+}\to \omega K^{+})}{\Gamma (B^{0}\to \omega K^{0})} = 1.8±0.4(stat.)±0.1(sys.)1.8\pm0.4({\rm stat.})\pm0.1({\rm sys.}). We also set the 90% confidence level upper limit B(B0→ωπ0)<2.0×10−6.{\mathcal B}(B^{0} \to \omega \pi^{0}) < 2.0\times 10^{-6}. In addition, we obtain the partial rate asymmetries ACP=0.05−0.07+0.08(stat.)±0.01(syst.){\mathcal A}_{CP} = 0.05^{+0.08}_{-0.07}(\rm {stat.}) \pm 0.01(\rm {syst.}) for B+→ωK+B^{+} \to \omega K^{+}, and ACP=−0.02±0.09(stat.)±0.01(syst.){\mathcal A}_{CP} = -0.02 \pm 0.09(\rm {stat.}) \pm 0.01(\rm {syst.}) for B+→ωπ+B^{+}\to \omega \pi^{+}.
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