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

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

2002-02-07

arxiv.org/abs/hep-ex/0202017v1

Phys.Rev.Lett.88:181803,2002

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.88.181803

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 ${\cal B}(B^{\pm}\to p \bar{p} K^{\pm}) =(4.3^{+1.1}_{-0.9}({\rm stat})\pm 0.5({\rm syst}))\times 10^{-6}.$ We also report upper limits for the decays $B^0\to p \bar{p} K_S$ and $B^{\pm}\to p \bar{p} \pi^{\pm}$.

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