DISTINCTIVE SIGNALS OF SPONTANEOUS R-PARITY BREAKING AT LEP-II

We consider the signals of pair-produced charginos in an e(+)e(-) coll ider, in a scenario where R-parity is spontaneously broken. The possib ility of lepton-chargino mixing, together with the presence of a Major on, opens-up the two-body decay channel of a chargino into a tau and a Majoron. We have studied the regions where this is the dominant decay of a chargino, and have shown that over a large region of the paramet er space the ensuing signals, namely tau-pails with missing-p(T), may rise well above standard model backgrounds at LEP-II. Such signals can also enable one to distinguish between spontaneous and explicit R-par ity breaking.