Supersymmetry with R-parity breaking: Contact interactions and resonance formation in leptonic processes at LEP2

In supersymmetric theories with R-parity breaking, trilinear couplings of two leptons to scalar sleptons are possible. In electron-positron collisions such interactions would manifest themselves through contact terms in Bhabha scattering, e+e− → e+e−, and in the annihilation to lepton pairs, e+e− → μ+μ− and τ+τ−. Interpreting the high x, high Q2 DIS HERA events as charm squark production with squark masses of order 200 GeV, the formation of tau-sneutrinos, e+e− → ντ, with a mass in the range close to the LEP2 energy or even within the reach of this machine, is an exciting speculation which can be investigated in the coming LEP2 runs with energies close to s = 200 GeV.