  Branching ratios, lepton forward-backward asymmetries, and lepton
polarization asymmetries for the flavor-changing neutral current (FCNC)
dileptonic decays of the $\Lambda_b$ baryon to the ground state and a number of
excited state $\Lambda$ baryons are calculated using form factors extracted
using wave functions from a constituent quark model. The SM branching ratios
for the transition to the ground state calculated using these quark model form
factors are consistent with the recent measurement reported by the LHCb
collaboration. It is shown that the lepton polarization asymmetries are largely
insensitive to the transition form factors and, therefore, to the effects of
QCD in the nonperturbative regime. These observables can therefore provide
somewhat model independent ways of extracting various combinations of the
Wilson coefficients.
