Search for Charmless Two-body Baryonic Decays of B Mesons

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.

6 pages, 4 figures and 1 table. Submitted to Phys. Rev. D Rapid Communications