DIS OPEN CHARM PRODUCTION AT HERA

ZEUS and H1 collaborations have measured integrated and differential cross sections for charm production in DIS, at the HERA ep collider, in the 1994 and 1995 data via the tagging of D* and D⁰ hadrons. was extracted and compared with theoretical predictions. Both the integrated cross sections and were found to be in agreement with the theoretical predictions. Finally it was measured that the dominating charm production mechanism at small scale Q² is described by boson-gluon fusion.