Single neutral heavy lepton production at electron-muon colliders

New heavy Majorana and Dirac neutrinos production at future electron-muon c olliders are investigated. The production of a single heavy neutrino is sho wn to be more relevant than pair production when comparing cross sections a nd neutrino mass ranges. The process e(+/-)mu (-/+) --> v l(+) W-/+ is stud ied including on-shell and off-shell heavy neutrino effects. Distributions are calculated including hadronization effects and experimental cuts that s uppress background, in order to have a clear signal for heavy neutral lepto ns. (C) 2000 Elsevier Science B.V. All rights reserved.