Hard and Precision QCD @ HERA
Guenter Grindhammer · DESY (CERN, DESY, Fermilab, IHEP, and SLAC) · 2017
Heavy quark production in DISMain prod.process is photon-gluon fusion Combine H1 & ZEUS measurements based on different tagging techniques •• reconstructed D* + , D + and D o meson decays •• µ and e from semi-leptonic decays •• analysis of tracks (VTX) exploiting lifetime info Extension of previous combination for charm [EPJ C 73 (2013) 2311] •• 3 new charm data sets •• 5 beauty data sets •• 13 analyses in total •• Reduced cross sections 4 up to 30% of the inclusive prod. is due to charm, up to 1% due to beauty Daniel Britzger -QCD results from HERA Moriond QCD 2017 Heavy quark production in DIS Heavy quark production • Produced in photon-gluon fusion in DIS Combination of charm and beauty cross sections • H1 & ZEUS measurements • 2.5 < Q 2 < 2000 GeV 2