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Lepton number violation could be manifest in the sneutrino sector ofsupersymmetric extensions of the standard model with conserved R-parity. Thensneutrinos decay partly into the ``wrong sign charged lepton'' final state, ifkinematically accessible. In sneutrino pair production or associated singlesneutrino production, the signal then is a like sign dilepton final state.Under favourable circumstances, such a signal could be visible at the LHC or anext generation linear collider for a relative sneutrino mass-splitting oforder ${\cal O}(0.001)$ and sneutrino width of order ${\cal O}$(1 GeV). On theother hand, the like sign dilepton event rate at the TEVATRON is probably toosmall to be observable.Comment: 19 pages, 14 Figures. Section about LSD at LHC and TEVATRON added.  Previous Title "Single sneutrino production and the wrong charged lepton  signal

Sneutrino-induced like sign dilepton signal with conservedRparity