Abstract
The first observation of the decays and is reported using a data sample corresponding to an integrated luminosity of , collected by the LHCb experiment in collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the and decays. Using both decay modes, the mass of the baryon is also measured to be , where the first and second uncertainties are statistical and systematic, respectively.
- Received 27 April 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.062001
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© 2017 CERN, for the LHCb Collaboration