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Observation of B+-->LambdaLambdaK+ |
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| Authors: | Lee Y-J Wang M-Z Abe K Abe K Abe T Aihara H Asano Y Aulchenko V Aushev T Aziz T Bahinipati S Bakich A M Ban Y Bedny I Bitenc U Bizjak I Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang P Chao Y Cheon B G Chistov R Choi S-K Choi Y Chuvikov A Danilov M Dash M Dong L Y Drutskoy A Eidelman S Eiges V Fratina S Gabyshev N Garmash A Gershon T Gokhroo G Golob B Guo R Haba J Hayasaka K Hayashii H Hazumi M Higuchi T Hinz L Hokuue T Hoshi Y Hou W-S Hsiung Y B Imoto A Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Kang J H Kang J S Katayama N Kawai H Kawasaki T Khan H R Kichimi H Kim H J Kim J H |
| Institution: | Department of Physics, National Taiwan University, Taipei. |
| Abstract: | We report the first observation of the charmless hyperonic B decay, B+-->LambdaLambdaK+, 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+-->LambdaLambdaK+) = (2.91(+0.90)(-0.70) +/- 0.38) x 10(-6). We also perform a search for the related decay mode B+-->LambdaLambdapi+, but do not find a significant signal. We set a 90% confidence-level upper limit of B(B+-->LambdaLambdapi+) < 2.8 x 10(-6). |
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