Sneutrino-Higgs mixing in WW and ZZ production in supersymmetry with R-parity violation

We consider new s-channel scalar exchanges in e(+)e(-) --> ZZ, W+W- in supe rsymmetry with a small lepton number violation, We show that a small biline ar R-parity violating term which leads to sneutrino-Higgs mixing can give r ise to a significant scaler resonance enhancement in e(+)e(-) --> ZZ, W+W-. We use the LEP2 measurements of the WW and ZZ cross-sections to place usef ul constraints on this scenario. We also fmd, under conservative assumption s on the relevant parameter space involved, that such an exchange of the sn eutrino-like admixture in e(+)e(-) --> ZZ, W+W- may be accessible to a 500 GeV e(+)e(-) collider. (C) 2001 Published by Elsevier Science B.V.