  We present a search for supersymmetry in the R-parity violating resonant
production and decay of smuons and muon-sneutrinos in the channels
smuon->neutralino_1 muon, smuon->neutralino_2 muon, and
muon-sneutrino->chargino muon. We analyzed 0.38 fb^-1 of integrated luminosity
collected between April 2002 and August 2004 with the D0 detector at the
Fermilab Tevatron Collider. The observed number of events is in agreement with
the standard model expectation, and we calculate 95% C.L. limits on the slepton
production cross section times branching fraction to gaugino plus muon, as a
function of slepton and gaugino masses. In the framework of minimal
supergravity, we set limits on the coupling parameter lambda'_211, extending
significantly previous results obtained in Run I of the Tevatron and at the
CERN LEP collider.
