ON THE MOTION OF HEAVY QUARKS INSIDE HADRONS - UNIVERSAL DISTRIBUTIONS AND INCLUSIVE DECAYS

In previous papers we have pointed out that there exists a QCD analog of the phenomenological concept of the so-called Fermi motion for the heavy quark inside a hadron. Here we show in a more detailed way how t his comes about and we analyze the limitations of this concept. Nonper turbative as well as perturbative aspects are included. We emphasize b oth similarities and differences to the well-known treatment of deep i nelastic lepton-nucleon scattering. We derive a model-independent lowe r bound on the kinetic energy of the heavy quark inside the hadron.