Observation of charmless baryonic decays B(s)0→pp¯h+h′−

Le résumé fourni par la source

Decays of ${B}^{0}$ and ${B}_{s}^{0}$ mesons to the charmless baryonic final states $p\overline{p}{h}^{+}{h}^{\ensuremath{'}\ensuremath{-}}$, where $h$ and ${h}^{\ensuremath{'}}$ 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 $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. Four-body charmless baryonic ${B}_{s}^{0}$ decays are observed for the first time. The decays ${B}_{s}^{0}\ensuremath{\rightarrow}p\overline{p}{K}^{+}{K}^{\ensuremath{-}}$, ${B}_{s}^{0}\ensuremath{\rightarrow}p\overline{p}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$, ${B}^{0}\ensuremath{\rightarrow}p\overline{p}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ and ${B}^{0}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the ${B}^{0}\ensuremath{\rightarrow}p\overline{p}{K}^{+}{K}^{\ensuremath{-}}$ decay and an upper limit is set on the branching fraction for ${B}_{s}^{0}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. Branching fractions in the kinematic region $m(p\overline{p})<2850\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ are measured relative to the ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}(\ensuremath{\rightarrow}p\overline{p}){K}^{*}(892{)}^{0}$ channel.

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