Comment on diquark fragmentation

We discuss diquark fragmentation and suggest that a spectator $\mathrm{uu}$ system in deep-inelastic lepton-nucleon scattering has a larger breakup probability than a $\mathrm{ud}$ system. The reason for this is argued to be that half of the leftover $\mathrm{ud}$ systems are in bound ${\mathrm{}\left(\mathrm{ud}\right)\mathrm{}}_0$ diquark configurations, while no such bound $\mathrm{uu}$ diquarks exist.