DOI 10.1007/s100520000218
Nonpartonic components in the nucleon structure functions at small Q2 in a broad range of x
A. Szczurek1 - V. Uleshchenko1,2
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
F2p(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
4 GeV2.
Copyright Springer-Verlag 2000
