Measurement of charm production using events with decays into muons with ZEUS at HERA

The production of heavy quarks in deep inelastic scattering was measured 
using events with semileptonic decays into muons with the ZEUS detector 
at HERA using an integrated luminosity of 120 pb-1. The charm, bottom and 
background content of the event sample with an identified muon was extracted 
by exploiting different characteristics of the decays of heavy quarks.  
Charm cross sections were determined for Q2>20 GeV2 and compared to NLO QCD 
calculations and to previous measurements based on other techniques.