Charm and beauty production in deep inelastic scattering  
           from inclusive secondary vertexing at ZEUS

                    ZEUS Collaboration 

                        Abstract

Charm and beauty production in deep inelastic scattering has been measured 
with the ZEUS detector using the full HERA II data set. The charm and 
beauty contents in events with a jet have been extracted using the decay 
length significance and invariant mass of secondary decay vertices.

Differential cross sections as a function of Q^2, Bjorken x, p_T(jet) and 
eta(jet) were measured and compared to theoretical predictions. The open 
charm and beauty contributions to the proton structure function F_2 were 
extracted.