We derive the lepton spectrum in semileptonic b decays from a nonperturbative treatment of QCD; it is based on an expansion in 1/mQ with mQ being the heavy flavor quark mass. The leading corrections arising on the 1/mQ level are completely expressed in terms of the difference in the mass of the heavy hadron and the quark. Nontrivial effects appear in 1/mQ² terms affecting mainly the end-point region; they are different for meson and baryon decays as well as for bottom and charm decays.
No takes yet. Share an insight, caveat, or question.
Bigi et al. (1993) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: