Abstract
The first observation of the decay of a meson to a purely baryonic final state, , 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 . The branching fraction is determined to be , where the first uncertainty is statistical and the second systematic. The decay mode is the rarest decay of the meson observed to date. The decay is also investigated. No signal is seen and the upper limit at 90% confidence level is set on the branching fraction.
- Received 7 September 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.232001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
© 2017 CERN, for the LHCb Collaboration