KIP-Veröffentlichungen

Recent measurements of charm and beauty production in ep collisions
at HERA are reviewed. Heavy quark tagging methods used by the
ZEUS and H1 experiments are described. Cross section results in both
photoproduction and deep inelastic scattering (DIS) are compared with
NLO QCD predictions. In general the data are well described by the
calculations. Studies of charm fragmention yield compatibility with
the assumption of universality at large transverse momenta, but illustrate
some problems with this assumption in the threshold region. The
DIS cross sections can also be expressed in terms of the charm and
beauty content of the proton, F₂^c and F₂^b. The most recent measurements
are compared to next-to-leading order QCD predictions using
different parameterisations of the theory, and of the gluon density in
the proton. The tests of the fragmentation function, the gluon density,
and details of the theoretical treatment of the charm and beauty masses
are of direct interest to corresponding applications at the LHC.