Search for Charmless Two-body Baryonic Decays of B Mesons

TL;DR

This study searched for rare baryonic decays of B mesons using data from the Belle detector but found no significant signals, setting upper limits on their branching fractions.

Contribution

First search for specific charmless two-body baryonic B meson decays with new upper limits on their branching fractions.

Findings

No statistically significant signals detected.

Set upper limits on branching fractions for the decays.

Provides constraints for theoretical models.

Abstract

We report the results of a search for the rare baryonic decays $B^0 \to p\bar{p}$, $\Lambda\bar{\Lambda}$, and $B^+ \to p\bar{\Lambda}$. The analysis is based on a data set of $31.7\times 10^6 B\bar{B}$ events collected by the Belle detector at the KEKB $e^+e^-$ collider. No statistically significant signals are found, and we set branching fraction upper limits ${\mathcal B}(B^0 \to p\bar{p}) < 1.2 \times 10^{-6}$, ${\mathcal B}(B^0 \to \Lambda\bar{\Lambda}) < 1.0 \times 10^{-6}$, and ${\mathcal B}(B^+ \to p\bar{\Lambda}) < 2.2 \times 10^{-6}$ at the 90% confidence level.