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The spectroscopy of the doubly heavy baryons including different heavy quarksis studied based on the heavy quark symmetry of QCD. We point out that, whenthe two heavy quarks are in $S$-wave, these baryons with a certain spin $j_l$of the light cloud can be classified into two sets: a heavy quark singlet withtotal spin of $j=j_l$ and a heavy quark multiplet with $j= (j_l+1) , j_l,\ldots \vert j_l-1\vert$, all the baryons in these two sets have the same massand, the baryons with the same quantum numbers in these two sets do not mixwith each other. We finally point out that the strong decay of the firstexcited baryon with light spin $j_l = 1/2$ to the ground state and one-pion isdetermined by the mass splitting through the generalized Goldberger--Treimanrelation.

Degeneracy of doubly heavy baryons from heavy quark symmetry