Systematics of radial excitations in heavy-light hadrons
  Some simple expectations for the quark mass dependence of radial excitation energies of heavy-light hadrons based on consideration of nonrelativistic quantum mechanics are discussed. Experimental and theoretical results are reviewed in light of these expectations. Some new lattice QCD results for masses of Lambda_b and Sigma_b baryons are presented. 
R.M. Woloshyn, Mark Wurtz
hep-ph hep-lat