@article{1b724d0a8d8b4a61b123e0e1785b396e, title = "Observation of charmless baryonic decays $B^0_{(s)} \to p \bar{p} h^+ h^{\prime-}$", abstract = "Decays of $B^0$ and $B_{s}^0$ mesons to the charmless baryonic final states $p \overline{p} h^+ h^{\prime-}$, where $h$ and $h^\prime$ each denote a kaon or a pion, are searched for using the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies of $7$ and $8\,$TeV, corresponding to an integrated luminosity of $3\,$fb$^{-1}$. Four-body charmless baryonic $B_{s}^0$ decays are observed for the first time. The decays $B^0_{s}\to p \overline{p} K^+ K^-$, $B^0_{s}\to p \overline{p} K^\pm \pi^\mp$, $B^0\to p \overline{p} K^\pm \pi^\mp$ and $B^0\to p \overline{p} \pi^+\pi^-$ are observed with a significance greater than $5$ standard deviations; evidence at $4.1$ standard deviations is found for the $B^0\to p \overline{p} K^+ K^-$ decay and an upper limit is set on the branching fraction for $B^0_{s}\to p \overline{p} \pi^+ \pi^-$. Branching fractions in the kinematic region $m(p \overline{p})", author = "Peter Clarke and Greig Cowan and Stephan Eisenhardt and Franz Muheim and Matthew Needham and Stephen Playfer and LHCb Collaboration", year = "2017", month = sep, day = "27", doi = "10.1103/PhysRevD.96.051103", language = "English", volume = "D96", pages = "051103", journal = "Physical Review", issn = "0031-899X", publisher = "American Institute of Physics Publising LLC", number = "5", }