  We study the Tevatron search potential for minimal supergravity (mSUGRA) and
find two observables which reveal complementary information on the mSUGRA
parameter space: the ``gold-plated'' decays of charginos/neutralinos to
trilepton final states and the rare decay B_s-> mu^+ mu^-. For the universal
gaugino mass, M_{1/2} below 250 GeV and for the universal scalar fermion mass,
M_0 outside of 200-370 GeV we face a ``no-lose'' situation for the Tevatron: If
tan(beta) < 30, the Tevatron has a chance to see the trilepton events but not
B_s -> mu^+ mu^- during Run IIa, whereas for larger tan(beta) the trilepton
events become invisible (at least with an integrated luminosity of 2 fb^{-1})
while B_s -> mu^+ mu^- is enhanced to an observable level. For this study we
perform an updated analysis of the trilepton signature which includes the full
set of the decay matrix elements and spin correlations. This leads to a new,
more promising search reach for the Tevatron.

High Energy Physics - Phenomenology