https://doi.org/10.1140/epjcd/s2004-03-1742-y
PS04 Hard QCD
Bottom and charm quark production in two-photon collisions at LEP
LPNHE CNRS/IN2P3 Universités P6 and P7, Paris, France
Received:
14
January
2004
Accepted:
20
January
2004
Published online:
3
March
2004
Heavy b and c quark production in γ
γ collisions has been measured at LEP. We report here the cross sections measurement and
made by DELPHI and L3 Collaboration. Inclusive D
*± (J/ ψ) has also been studied by L3 (DELPHI). The cross section for b production is found to exceed QCD predictions. The new DELPHI analysis using for the first time K-lepton double tagging in γ
γ physics confirms this excess.
© Società Italiana di Fisica, Springer-Verlag, 2004