# First observation of a baryonic $B^0_s$ decay

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). First observation of a baryonic $B^0_s$ decay. Physical Review Letters, 119(4):041802.

## Abstract

We report the first observation of a baryonic $B^0_s$ decay, $B^0_s \to p\overline{\Lambda}K^-$, 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  fb$^{−1}$. The branching fraction is measured to be $\mathcal{B}(B^0_s \to p\overline{\Lambda} K^−) + \mathcal{B}(B^0_s \to \overline{p}\Lambda K^+) = [5.46 \pm 0.61 \pm 0.57 \pm 0.50(\mathcal{B}) \pm 0.32 (f_s/f_d)] \times 10^{−6}$, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the $B^0 \to p\overline{\Lambda}\pi^−$ decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of $b$-quark hadronization probabilities $f_s/f_d$.

## Abstract

We report the first observation of a baryonic $B^0_s$ decay, $B^0_s \to p\overline{\Lambda}K^-$, 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  fb$^{−1}$. The branching fraction is measured to be $\mathcal{B}(B^0_s \to p\overline{\Lambda} K^−) + \mathcal{B}(B^0_s \to \overline{p}\Lambda K^+) = [5.46 \pm 0.61 \pm 0.57 \pm 0.50(\mathcal{B}) \pm 0.32 (f_s/f_d)] \times 10^{−6}$, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the $B^0 \to p\overline{\Lambda}\pi^−$ decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of $b$-quark hadronization probabilities $f_s/f_d$.

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