Rare $B^-\to\Lambda\bar{p}\nu\bar{\nu}$ decay

TL;DR

This paper calculates the branching ratio of the rare baryonic decay $B^- o ext{Lambda} ar{p} u ar{ u}$ within the Standard Model, highlighting its potential to probe new physics at future B factories.

Contribution

The study provides the first Standard Model prediction for the branching ratio of the rare baryonic decay $B^- o ext{Lambda} ar{p} u ar{ u}$ and discusses its sensitivity to new physics.

Findings

Branching ratio estimated as (7.9 ± 1.9) × 10^{-7}.

Decay is sensitive to new physics similar to other rare B decays.

Accessible to future B factory experiments.

Abstract

We study the four-body semileptonic baryonic decay of $B^-\to \Lambda\bar p\nu\bar \nu$ in the standard model. We find that the decay branching ratio is $(7.9\pm 1.9)\times 10^{-7}$. Similar to the rare decays of $B^-\to K^{(*)-}\nu\bar \nu$, this baryonic decay of $B^-\to \Lambda\bar p\nu\bar \nu$ is also sensitive to new physics and accessible to the future $B$ factories.