  We study SU(2) color QCD with even number of quark flavors. First, using QCD
inequalities we show that at finite baryon chemical potential mu, condensation
must occur in the channel with scalar diquark quantum numbers. This breaks the
U(1) symmetry generated by baryon charge (baryon superconductivity). Then we
derive the effective Lagrangian describing low lying meson and baryon
excitations using extended local chiral symmetry of the theory. This enables us
to determine the leading term in the dependence of the masses on mu exactly.
