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Observation of B+ to Lambda Lambdabar K+ | | Y.-J. Lee
; M.-Z. Wang
; et al
; | | Date: |
24 Jun 2004 | | Journal: | Phys.Rev.Lett. 93 (2004) 211801 | | Subject: | hep-ex | | Affiliation: | Belle Collaboration | | 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. | | Source: | arXiv, hep-ex/0406068 | | Services: | Forum | Review | PDF | Favorites | |
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