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 supersymmetry with a small lepton number violation. We show that a small bilinear R-parity violating term which leads to sneutrino–Higgs mixing can give rise to a significant scalar resonance enhancement in e⁺e⁻→ZZ, W⁺W⁻. We use the LEP2 measurements of the WW and ZZ cross-sections to place useful constraints on this scenario. We also find, under conservative assumptions on the relevant parameter space involved, that such an exchange of the sneutrino-like admixture in e⁺e⁻→ZZ, W⁺W⁻ may be accessible to a 500 GeV e⁺e⁻ collider.