Perturbative QCD Fragmentation Functions as a Phenomenological Model for   Charm/Bottom Fragmentation
  The perturbative QCD fragmentation functions can be applied phenomenologically as a model for charm and bottom quark fragmentation into heavy-light mesons. The predictions by this model on the observables $P_V$ and $\langle z \rangle$ for $D-D^*$ and $B-B^*$ systems are compared with experimental data. 
Kingman Cheung