New signatures for a light stop at LEP2 in SUSY models with spontaneously broken R-parity

In a class of supersymmetric models with R-parity breaking the lightest stop can have new decay modes into third generation fermions, t1 → b + τ. We show that this decay may be dominant or at least comparable to the ordinary R-parity conserving mode t1 → c + χ10, where χ10 denotes the lightest neutralino. The new R-parity violating decay modes could provide new signatures for stop production at LEP.