We search for the decays B-→ϕK-γ and B̅ 0→ϕK̅ 0γ in a data sample of 228×10^6 BB̅ pairs collected at the Υ(4S) resonance with the BABAR detector. We measure the branching fraction B(B-→ϕK-γ)=(3.5±0.6±0.4)×10-6 and set an upper limit B(B̅ 0→ϕK̅ 0γ)<2.7×10-6 at the 90% confidence level. We also measure the direct CP asymmetry in B-→ϕK-γ, ACP=(-26±14±5)%. The uncertainties are statistical and systematic, respectively.
Measurement of B decays to ϕKγ
SIMI, GABRIELE;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2007
Abstract
We search for the decays B-→ϕK-γ and B̅ 0→ϕK̅ 0γ in a data sample of 228×10^6 BB̅ pairs collected at the Υ(4S) resonance with the BABAR detector. We measure the branching fraction B(B-→ϕK-γ)=(3.5±0.6±0.4)×10-6 and set an upper limit B(B̅ 0→ϕK̅ 0γ)<2.7×10-6 at the 90% confidence level. We also measure the direct CP asymmetry in B-→ϕK-γ, ACP=(-26±14±5)%. The uncertainties are statistical and systematic, respectively.File in questo prodotto:
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