  We describe a general search for resonances decaying to a neutral e-mu final
state in ppbar collisions at a center-of-mass energy of 1.96 TeV. Using a data
sample representing 344 pb^-1 of integrated luminosity recorded by the CDF-II
experiment, we compare Standard Model predictions with the number of observed
events for invariant masses between 50 and 800 GeV/c^2. Finding no significant
excess (5 events observed vs. 7.7 +/- 0.8 expected for e-mu invariant masses >
100 GeV/c^2), we set limits on sneutrino and Z' masses as functions of lepton
family number violating couplings.
