Nonpartonic components in the nucleon structure functions at small $Q^2$ in a broad range of $x$

A. Szczurek; V. Uleshchenko

doi:doi:10.1007/s100520000218

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Particles and Fields

\n This email address is being protected from spambots. You need JavaScript enabled to view it. ), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> Eur. Phys. J. C 12, 663-671
DOI 10.1007/s100520000218

Nonpartonic components in the nucleon structure functions at small Q² in a broad range of x

A. Szczurek¹ - V. Uleshchenko^1,2

¹ Institute of Nuclear Physics, 31-342 Cracow, Poland
² Institute for Nuclear Research, 252028 Kiev, Ukraine

Received: 10 May 1999 / Revised version: 9 July 1999 /
Published online: 3 February 2000 - © Springer-Verlag 2000 2000

Abstract
We construct a simple two-phase model of the nucleon structure functions valid for both small and large Q² and in the broad range of Bjorken x. The model incorporates hadron dominance at small xand Q² and parton model at large Q². The VDM contribution is modified for small fluctuation times of the hadronic state of the photon. With two free parameters we describe SLAC, CERN NMC, Fermilab E665 and CERN BCDMS data for both proton and deuteron structure functions. Our model explains some phenomenological higher-twist effects extracted from earlier analyses. A good description of the NMC F₂^p(x) - F₂ⁿ(x) data is obtained in contrast to other models in the literature. We predict faster vanishing of the partonic component at low Q² than previously expected and strong Q² dependence of the Gottfried Sum Rule below $Q^2 \approx$ 4 GeV².