The description of F2 at low Q2
A.D. Martin1 - M.G. Ryskin1,2 - A.M. Stasto1,3
1 Department of Physics, University of Durham,
Durham, DH1 3LE, UK
2 Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg, Russia
3 H. Niewodniczanski Institute of Nuclear Physics, 31-342 Krakow, Poland
Received: 1 June 1998 / Revised version: 4 September 1998 / Published online: 19 November 1998
We analyse the data for the proton structure function F2 over the entire Q2 domain, including especially low Q2, in terms of perturbative and non-perturbative QCD contributions. The small distance configurations are given by perturbative QCD, while the large distance contributions are given by the vector dominance model and, for the higher mass states, by the additive quark approach. The interference between states of different mass (in the perturbative contribution) is found to play a crucial role in obtaining an excellent description of the data throughout the whole Q2 region, including photoproduction.