First evidence for the two-body charmless baryonic decay B0 → pp̄

The LHCb Collaboration

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The results of a search for the rare two-body charmless baryonic decays B0 → pp̄ and B0s → pp̄ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb-1, of pp collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of B0 → pp̄ candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic B0 decay. No significant B0s → pp̄ signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions are (Equation) where the first uncertainty is statistical and the second is systematic.

Original languageEnglish
Article number5
Number of pages17
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - Oct 2013
Externally publishedYes


  • B physics
  • Branching fraction
  • Flavor physics
  • Hadron-Hadron scattering
  • QCD

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