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Measurement of the branching fractions for B ---> omega K and B ---> omega pi

Collaboration
Mar, 2004
7 pages
Published in:
  • Phys.Rev.D 70 (2004) 012001
e-Print:
DOI:
Report number:
  • BELLE-PREPRINT-2004-2,
  • KEK-PREPRINT-2003-114
Experiments:
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Abstract:
We report improved measurements of branching fractions for charmless hadronic two-body {\it B} meson decays containing an ω\omega meson in the final state. The results are based on a data sample of 78 fb−1^{-1} collected on the Υ(4S)\Upsilon(4S) resonance by the Belle detector. We measure the branching fractions B(B+→ωK+)=(6.5−1.2+1.3±0.6)×10−6{\mathcal B}(B^+ \to \omega K^+) = (6.5^{+1.3}_{-1.2}\pm 0.6)\times 10^{-6} and B(B+→ωπ+)=(5.7−1.3+1.4±0.6)×10−6.{\mathcal B}(B^+ \to \omega \pi^+) = (5.7^{+1.4}_{-1.3}\pm 0.6)\times 10^{-6}. We give 90% confidence upper limits for B(B0→ωK0)<7.6×10−6{\mathcal B}(B^0 \to \omega K^0) < 7.6\times 10^{-6} and B(B0→ωπ0)<1.9×10−6.{\mathcal B}(B^0 \to \omega \pi^0) < 1.9\times 10^{-6}. We also obtain the partial rate asymmetries ACP=0.06−0.18+0.21±0.01{\mathcal A}_{CP}=0.06^{+0.21}_{-0.18}\pm 0.01 for B±→ωK±B^\pm \to \omega K^\pm and ACP=0.50−0.20+0.23±0.02{\mathcal A}_{CP}=0.50^{+0.23}_{-0.20}\pm 0.02 for B±→ωπ±.B^\pm \to \omega \pi^\pm.
  • 14.40.Nd
  • 13.25.Hw
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • omega(783)
  • B+: branching ratio
  • B0: branching ratio