Measurement of charm and beauty photoproduction 
             from inclusive secondary vertexing at HERA-II

                     ZEUS Collaboration 

                         Abstract

Photoproduction of beauty and charm quarks in events with two jets has 
been measured with the ZEUS detector at HERA using an integrated 
luminosity of ~130 pb-1. The beauty and charm content was extracted using 
the decay-length significance of the b and c hadrons and the invariant 
mass of the decay vertices. Differential cross sections as a function of 
pT(Jet) and eta(Jet) are compared with the Pythia leading order plus 
parton shower (LO+PS) Monte Carlo and QCD predictions calculated at 
next-to-leading order.