Possible sneutrino-pair signatures with R-parity breaking

If sneutrinos are the lightest supersymmetry partners and R-parity is not conserved, the process e+e− → tildeνtildeν can have striking signatures due to the decay modes tildeν → ℓ+ℓ′− or tildeν → qq′. We present cross section formulas and discuss event rates and detection at the upgraded e+e− collider LEP. Four-lepton signals should be detectable up to sneutrino mass m̃ν = 80 GeV and maybe beyond; four-jet signals should be detectable up to m̃ν = 70 GeV, but would probably be obscured thereafter by WW background.