Constraining the Proton's Gluon Density by Inclusive Charm   Electroproduction at HERA
  We analyze the capability of charm production in deep-inelastic ep scattering at HERA to constrain the gluon distribution g(y,\mu^2) of the proton. The dependence of the theoretical predictions for the charm structure function F_2^c on the mass factorization scale \mu and the charm mass is investigated. F_2^c seems to be well suited for a rather clean and local gluon measurement at small momentum fractions y. 
A. Vogt (Univ. W\"urzburg)