Abstract
Results are reported from a search for the rare decays and , where the lepton is reconstructed in the channel . These processes are effectively forbidden in the standard model, but they can potentially occur at detectable rates in models of new physics that can induce lepton-flavor-violating decays. The search is based on a data sample corresponding to of proton-proton collisions recorded by the LHCb experiment in 2011 and 2012. The event yields observed in the signal regions for both processes are consistent with the expected standard model backgrounds. Because of the limited mass resolution arising from the undetected neutrino, the and signal regions are highly overlapping. Assuming no contribution from , the upper limit is obtained at 95% confidence level. If no contribution from is assumed, a limit of is obtained at 95% confidence level. These results represent the first limit on and the most stringent limit on .
- Received 17 May 2019
DOI:https://doi.org/10.1103/PhysRevLett.123.211801
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© 2019 CERN, for the LHCb Collaboration