We consider the single chargino production at Tevatron p (p) over bar --> (
v) over tilde(i) --> <(chi)over tilde>(1) +/- l(i)double dagger as induced
by the resonant sneutrino production via a dominant R-parity violating coup
ling of type chi(ijk)L(i)D(k)(c). Within a supergravity model, we study the
three leptons final state. The comparison with the expected background dem
onstrate that this signature allows to extend the sensitivity on the supers
ymmetric mass spectrum beyond the present LEP limits and to probe the relev
ant R-parity violating coupling down to values one order of magnitude small
er than the most stringent low energy indirect bounds. The trilepton signal
offers also the opportunity to reconstruct the neutralino mass in a model
independent way with good accuracy. (C) 2000 Elsevier Science B.V. All righ
ts reserved.