Abstract
A search for heavy Majorana neutrinos produced in the decay mode is performed using of integrated luminosity collected with the LHCb detector in collisions at center-of-mass energies of 7 and 8 TeV at the LHC. Neutrinos with masses in the range 250 to 5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction as functions of neutrino mass and lifetime. These limits are on the order of for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino.
- Received 21 January 2014
DOI:https://doi.org/10.1103/PhysRevLett.112.131802
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© 2014 CERN, for the LHCb collaboration