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Observation of and decays

2017 
The decays and are observed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb, collected by the LHCb experiment in proton–proton collisions at the centre-of-mass energies of 7 and 8. The branching fractions relative to that of are measured to be where the first uncertainties are statistical and the second are systematic.
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