CURRENT QUARK MASSES AND STRUCTURE FUNCTIONS

Bare quark distribution functions are constructed for valence quarks in 0-, 1- mesons and (1/2)+, (32)+ baryons. The integrated x-1 moments of these structure functions lead to five independent determinations of the bare or current quark mass scale, all giving m=(mu+md)262 MeV and all consistent with the current quark mass ratio msm5. Furthermore, the approach also leads to a charmed current quark mass mc1200 MeV. © 1979 The American Physical Society.