The hyperfine mass splittings of baryons containing a heavy quark are derived
at leading order in large N QCD. Hyperfine splittings either preserve or
violate heavy quark spin symmetry. Previous work proves that the splittings
which preserve heavy quark spin symmetry are proportional to J2 at
order 1/N, where J is the angular momentum of the light degrees of freedom
of the baryon. This work proves that the splittings which violate heavy quark
spin symmetry are proportional to Jβ SQβ at order 1/(NmQβ) in the 1/N and 1/mQβ expansions.Comment: (8 pages, no figures, uses harvmac), UCSD/PTH 93-2