Study of B+ to p Lambdabar gamma, p Lambdabar pi0 and B0 to p Lambdabar pi-

Understand

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}\pm 0.33) times 10^{-6}.
• We also set upper limits on branching fractions of the two-body decays B0 to p Sigmabar^{*-}, B0 to Delta^0 Lambdabar, B+ to p Sigmabar^{*0}, and B+ to Delta^+ Lambdabar at the 90% confidence level.