Heavy quark fragmentation to baryons containing two heavy quarks

We discuss the fragmentation of a heavy quark to a baryon containing two heavy quarks of mass mQ>>ΛQCD. In this limit the heavy quarks first combine perturbatively into a compact diquark with a radius small compared to 1ΛQCD, which interacts with the light hadronic degrees of freedom exactly as does a heavy antiquark. The subsequent evolution of this QQ diquark to a QQq baryon is identical to the fragmentation of a heavy antiquark to a meson. We apply this analysis to the production of baryons of the form ccq, bbq, and bcq.