The Majorana nature of neutrinos may only be experimentally verified via lepton-number violating processes involving charged leptons. We explore the $\Delta L=2$ like-sign dilepton production at hadron colliders to search for signals of Majorana neutrinos. We find significant sensitivity for resonant production of a Majorana neutrino in the mass range of 10–80 GeV at the current run of the Tevatron with $2{\mathrm{fb}}^{-1}$ integrated luminosity and in the range of 10–400 GeV at the CERN LHC with $100{\mathrm{fb}}^{-1}$.

• Received 11 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.171804