Abstract
A search for the rare decays and is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of of collisions at a center-of-mass energy of 7 TeV and at 8 TeV. An excess of signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of is obtained and an upper limit of at 95% confidence level is set. These results are consistent with the standard model expectations.
- Received 18 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.101805
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© 2013 CERN, for the LHCb Collaboration