Observation of B+ ---> Lambda anti-Lambda K+
Collaboration
9 pages
Published in:
- Phys.Rev.Lett. 93 (2004) 211801
e-Print:
- hep-ex/0406068 [hep-ex]
Report number:
- BELLE-PREPRINT-2004-17,
- KEK-PREPRINT-2004-24
Experiments:
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Citations per year
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.- 13.60.Rj
- 13.25.Hw
- B mesons
- meson hadronic decay
- kaon production
- hyperon production
- pion production
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
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