Observation of $B^{\pm }\to p\bar{p}{K}^{\pm }$

Abstract

We report the observation of the decay mode $B^{\pm }\to p\bar{p}{K}^{\pm }$ based on an analysis of 29.4 fb${}^{-1}$ of data collected by the Belle detector at KEKB. This is the first example of a $b\to s$ transition with baryons in the final state. The $p\bar{p}$ mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be $\mathcal{B}(B^{\pm }\to p\bar{p}{K}^{\pm })=(4.3_{-0.9}^{+1.1}(\mathrm{stat})\pm 0.5(\mathrm{syst}))\times 10^{-6}.$ We also report upper limits for the decays $B^0\to p\bar{p}{K}_S$ and $B^{\pm }\to p\bar{p}{\pi }^{\pm }$.

6 pages, 2 figures, and 1 table. Submitted to Phys. Rev. Lett

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