Observation of B+ -> p Lambdabar gamma

Details Observation of B+ -> p Lambdabar gamma Observation of B+ -> p Lambdabar gamma

2005-03-26

arxiv.org/abs/hep-ex/0503046v2

Phys.Rev.Lett.95:061802,2005

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 3 figures, 1 table (update of hep-ex/0409009 for journal submission)

Scientific paper

10.1103/PhysRevLett.95.061802

We report the first observation of the radiative hyperonic B decay B+ -> p Lambdabar gamma, using a 140 fb^{-1} data sample recorded on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+ -> p Lambdabar gamma) = (2.16 ^{+0.58}_{-0.53} \pm 0.20) \times 10^{-6}. We examine its M_pLambdabar distribution and observe a peak near threshold. This feature is expected by the short-distance b -> s gamma transition. A search for B+ -> p Sigmabar gamma yields no significant signal and we set a 90% confidence-level upper limit on the branching fraction of B(B+ -> p Sigmabar gamma) < 4.6 \times 10^{-6}.

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