Observation of B+ to Lambda Lambdabar K+

Details Observation of B+ to Lambda Lambdabar K+ Observation of B+ to Lambda Lambdabar K+

2004-06-24

arxiv.org/abs/hep-ex/0406068v2

Phys.Rev.Lett.93:211801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.211801

We report the first observation of the charmless hyperonic B decay, B^+ --> Lambda Lambdabar K^+, using a 140 fb^-1 data sample recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e^+e^- collider. The measured branching fraction is B(B^+ --> Lambda Lambdabar K^+) = 2.91 ^{+0.90}_{-0.70} +/- 0.38 *10^-6 . We also perform a search for the related decay mode B^+ --> Lambda Lambdabar pi^+, but do not find a significant signal. We set a 90% confidence-level upper limit of B(B^+ --> Lambda Lambdabar pi^+) < 2.8 * 10^-6.

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