Jψ production via fragmentation at HERA

We compute the contributions to large-pT Jψ production at DHEA coming from fragmentation of gluons and charm quarks. We find that the charm quark fragmentation contribution dominates over the direct production of Jψ via photongluon fusion at large-pT, while the gluon fragmentation is negligibly small over the whole range of pT. An experimental study of pT distributions of Jψ at HERA will providea direct probe of the charm quark fragmentation functions.