The description of $F_2$ at low $Q^2$

A.D. Martin; M.G. Ryskin; A.M. Stasto

doi:doi:10.1007/s100529801035

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 7, 643-654
DOI 10.1007/s100529801035

The description of F₂ at low Q²

A.D. Martin¹ - M.G. Ryskin^1,2 - A.M. Stasto^1,3

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

Abstract
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 $q \overline{q}$ states, by the additive quark approach. The interference between states of different $q\bar{q}$ 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.