Abstract
A search for the decays and is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and , respectively. No signal is observed. Assuming no contribution from decays, an upper limit on the branching fraction is obtained at 90(95)% confidence level. If no contribution is assumed, a limit of is determined at 90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values.
- Received 10 March 2020
- Accepted 22 April 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.211802
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© 2020 CERN, for the LHCb Collaboration