Massimo Corradi (INFN, Sezione di Bologna)
Combination of F2^cc from DIS measurements at HERA The charm contribution F2^cc to the proton structure function F2 is determined. The results of D meson production cross section measurements are combined with the measurements using semi-leptonic decays into muons as well as inclusive track measurements. The correlations of the systematic uncertainties between different measurements are taken into account. The data cover the kinematic range of photon virtuality 2 < Q^2 < 1000 GeV^2 and Bjorken scaling variable 10^-5 < x < 10^-1. PDF fits including F2^cc data The combined H1 and ZEUS data on inclusive ep cross-sections together with the combined data on the semi-inclusive structure function F2(charm) are used to extract the parton densities of the proton at NLO. The inclusion of the F2(charm) data allows detailed tests of the heavy flavour treatment in various QCD calculations.