Observation of ηc (2 S) → p p bar and search for X (3872) → p p bar decays
Abstract
The first observation of the decay ηc (2 S) → p p bar is reported using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb-1 recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ηc (2 S) resonance is produced in the decay B+ → [ c c bar ]K+. The product of branching fractions normalised to that for the J / ψ intermediate state, R ηc (2 S), is measured to be
- Publication:
-
Physics Letters B
- Pub Date:
- June 2017
- DOI:
- 10.1016/j.physletb.2017.03.046
- Bibcode:
- 2017PhLB..769..305A