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F2gamma at low Q2 and sigmaγγ at high energies

B. Badelek, J. Kwiecinski, A. Stasto

hep-pharXiv:hep-ph/9903248

Abstract

The parametrisation of the photon structure function in the low Q2 region is formulated. It includes the VMD contribution and the QCD improved parton model component suitably extrapolated to the low Q2 region. The parametrisation describes reasonably well existing experimental data on sigmaγγ for real photons and the low Q2 data on sigmaγ* γ. Predictions for sigmaγγ and for sigmaγ* γ for energies which may be accesssible in future linear colliders are also given.

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