Study of B+ to p Lambdabar gamma, p Lambdabar pi0 and B0 to p Lambdabar pi-
Abstract
We study the charmless baryonic three-body decays of B mesons: B+ to p Lambdabar gamma, B+ to p Lambdabar pi0 and B0 to p Lambdabar pi-. The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. This study includes the first observation of B+ to p Lambdabar pi0, which is measured to have a branching fraction of (3.00+0.61-0.53 0.33) times 10-6. We also set upper limits on branching fractions of the two-body decays B0 to p Sigmabar*-, B0 to Delta0 Lambdabar, B+ to p Sigmabar*0, and B+ to Delta+ Lambdabar at the 90% confidence level. These results are obtained from a 414fb-1 data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.