Journal article

Observation of B -> Lambda(Lambda)over-barK( )

YJ Lee, MZ Wang, K Abe, K Abe, T Abe, H Aihara, Y Asano, V Aulchenko, T Aushev, T Aziz, S Bahinipati, AM Bakich, Y Ban, I Bedny, U Bitenc, I Bizjak, A Bondar, A Bozek, M Bracko, J Brodzicka Show all

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2004

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).