Measurement of D+- production production and F2c
            extraction in deep inelastic scattering at ZEUS

                     ZEUS Collaboration

                          Abstract 

The production of charm quark in deep inelastic ep scattering has been measured 
with the ZEUS detector at HERA using an integrated luminosity of 323 pb-1. Charm 
events were identified through the D+ -> K- pi+ pi+ (+cc) decay channel. A 
lifetime tag based on decay length significance was applied to improve the signal 
to background ratio. The kinematic region was 1.5 < p_T(D+) < 15 GeV, |eta(D+)| < 
1.6, 5 < Q^2 < 1000 GeV^2 and 0.02 < y < 0.7. Inclusive and differential cross 
sections for D+ production were measured and compared to next-to-leading-order 
QCD calculations and published ZEUS results. The charm contribution to the proton 
structure function, F2c, was extracted. The results agree with previous 
measurements and are well described by QCD predictions.