Excited State Contributions to the Heavy Baryon Fragmentation Functions   in a Quark-Diquark Model
  Spin dependent fragmentation functions for heavy flavor quarks to fragment into heavy baryons are calculated in a quark-diquark model. The production of intermediate spin 1/2 and 3/2 excited states is explicity included. The resulting $\Lambda_b$ production rate and polarization at LEP energies are in agreement with experiment. The $\Lambda_c$ and $\Xi_c$ functions are also obtained. The spin independent $f_1(z)$ is compared to data. The integrated values for production rates agree with the data. 
A. Adamov (1) and Gary R. Goldstein (1 and 2) ((1) Tufts University,   (2) MIT)