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We study the exclusive rare decay B -> K l(bar) l. We calculate the relevantform factors within a relativistic constituent quark model, for the first timewithout employing the impulse approximation. The calculated form factors areused to evaluate differential decay rates and polarization observables. Wepresent results on the q2-dependence of a set of observables with and withoutlong-distance contributions. A similar analysis is done for the exclusive raredecays B_c -> D (D*) l(bar) l with special emphasis on the cascade decay B_c ->D* (-> D pi) l(bar) l. We derive a four-fold angular decay distribution forthis process in terms of helicity amplitudes including lepton mass effects. Thefour-fold angular decay distribution allows to define a number of physicalobservables which are amenable to measurement. We compare our results with theresults of other studies.Comment: 28 pages, 12 figure

The exclusive rare decays $$B \rightarrow k{\bar l}l$$ and $$B_c \rightarrow D(D^*){\bar l}l$$ in a relativistic quark model