Abstract
A search for the rare decays and is performed using proton–proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of collected in 2011 and 2012. The leptons are reconstructed through the decay . Assuming no contribution from decays, an upper limit is set on the branching fraction at the 95% confidence level. If instead no contribution from decays is assumed, the limit is at the 95% confidence level. These results correspond to the first direct limit on and the world’s best limit on .
- Received 13 March 2017
DOI:https://doi.org/10.1103/PhysRevLett.118.251802
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© 2017 CERN, for the LHCb Collaboration