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# First observation of a baryonic $$B_s^0$$ decay

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### Abstract

We report the first observation of a baryonic $$B_s^0$$ decay, $$B_s^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} K^-$$, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of $$3.0\,\mathrm{fb}^{-1}$$. The branching fraction is measured to be $$\mathcal{B}(B_s^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} K^-) + \mathcal{B}(B_s^0 \to \bar{p} \Lambda K^+) = \left[5.46 \pm 0.61 \pm 0.57 \pm 0.50 (\mathcal{B}) \pm 0.32 (f_s/f_d)\right]\times 10^{-6},$$ where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the $$B^0 \to p \kern 0.1em\overline{\kern -0.1em\Lambda} \pi^-$$ decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of $$b$$-quark hadronization probabilities $$f_s/f_d$$.

### Author and article information

###### Journal
2017-04-25
###### Article
1704.07908