## First Observation of the Rare Purely Baryonic Decay $B^0\to p\bar p$

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Original language English Aaij:2017gum 232001 Physical Review Letters 119 23 10.1103/PhysRevLett.119.232001 Published - 4 Dec 2017

### Abstract

The first observation of the decay of a B0 meson to a purely baryonic final state, B0→pp¯, is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3.0  fb-1. The branching fraction is determined to be B(B0→pp¯)=(1.25±0.27±0.18)×10-8, where the first uncertainty is statistical and the second systematic. The decay mode B0→pp¯ is the rarest decay of the B0 meson observed to date. The decay Bs0→pp¯ is also investigated. No signal is seen and the upper limit B(Bs0→pp¯)

ID: 50415865