Tau lepton mixing with charginos and its effects on chargino searches at e(+)e(-) colliders

In bilinear R-parity violating models where a term epsilon(3)L(3)H(2) is in troduced in the superpotential, the tau lepton can mix with charginos. We s how that this mixing is fully compatible with LEP1 precision measurements o f the Z tau tau and W tau nu(tau) couplings even for large values of epsilo n(3) and of the induced vacuum expectation value nu(3) of the tau-sneutrino . The single production of charginos at e(+)e(-) colliders is possible in t his case and we present numerical values of the cross-section at LEP1, LEP2 and an NLC. We find maximum values of 10 pb at LEP1 and 1 fb at NLC, while the corresponding values at LEP2 are too small to observe. (C) 1998 Elsevi er Science B.V. All rights reserved.