Single sneutrino/slepton production at LEP2 and the NLC

We propose a new method of detecting supersymmetry at LEP2 and the NLC when R-parity is violated by an LLĒ operator. We consider the processes eγ→ν̃jek and eγ→l̃kν̄j which can test seven of the nine LLĒ-operators. A Monte Carlo analysis is performed to investigate the sensitivity to the sneutrino signal, and the 5σ discovery contours in the mν̃j vs. λ plane are presented. For an integrated luminosity of 100 pb−1, sneutrinos with masses up to Mν̃<170 GeV/c2 could be discovered in the near future at LEP2. For the charged slepton production the cross-section is too low to be detectable.