Observation of B0 to p Lambdabar pi-

TL;DR

This paper reports the first observation of the charmless hyperonic B decay B0 -> p Lambdabar pi- with a measured branching fraction, and sets upper limits for related decay modes, using data from the Belle detector.

Contribution

First observation of the B0 -> p Lambdabar pi- decay mode, providing new measurements of its branching fraction and setting limits on related decay channels.

Findings

Branching fraction for B0 -> p Lambdabar pi- is approximately 4 x 10^-6.

No significant signals for B0 -> p Lambdabar K- and p Sigmabar0 pi- decays.

Upper limits established for the branching fractions of the non-observed decay modes.

Abstract

We report the first observation of the charmless hyperonic B decay, B0 -> p Lambdabar pi-, using a 78 fb^-1 data sample recorded on the Upsilon(4S) resonance with the Belle detector at KEKB. The measured branching fraction is B(B0 -> p Lambdabar pi-) = (3.97 ^{+1.00}_{-0.80} +- 0.56) * 10^-6. Searches for B0 -> p Lambdabar K- and p Sigmabar0 pi- yield no significant signals and we set 90% confidence level upper limits of B(B0 -> p Lambdabar K-) < 8.2 * 10^-7 and B(B0 -> p Sigmabar0 pi-) < 3.8 * 10^-6.