Observation of B+ to Lambda Lambdabar K+
Y. -J. Lee, M. -Z. Wang
Abstract
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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