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The rare processes $B_c\to D_{(s)J} ^{(*)}\mu\bar{\mu}$, where$D_{(s)J}^{(*)}$ stands for the final meson $D_{s0}^*(2317)$,$D_{s1}(2460,2536)$,~$D_{s2}^*(2573)$, $D_0^*(2400)$, $D_{1}(2420,2430)$or~$D_{2}^*(2460)$, are studied within the Standard Model. The hadronic matrixelements are evaluated in the Bethe-Salpeter approach and furthermore adiscussion on the gauge-invariant condition of the annihilation hadroniccurrents is presented. Considering the penguin, box, annihilation,color-favored cascade and color-suppressed cascade contributions, theobservables $\text{d}Br/\text{d}Q^2$, $A_{LPL}$, $A_{FB}$ and $P_L$ arecalculated.

The rare semi-leptonic $B_c$ decays involving orbitally excited final mesons