DOI 10.1007/s100520000320
Studies of higher twist and higher order effects in
NLO
and
NNLO QCD analysis of lepton-nucleon scattering data
on F2 and
U.K. Yang - A. Bodek
Department of Physics and Astronomy,
University of Rochester, Rochester, NY 14627, USA
Received: 7 October 1999 / Revised version: 9 December 1999 /
Published online: 3 February 2000 - © Springer-Verlag 2000
Abstract
We report on the extraction of the higher twist contributions
to F2 and
from global NLO and NNLO QCD
fits to lepton nucleon scattering
data over a wide range of Q2. The NLO fits require both
target mass and higher twist contributions at low Q2.
However, in the NNLO analysis,
the data are described by the NNLO QCD predictions
(with target mass corrections) without the need for any significant
contributions from higher twist effects. An estimate of the
difference between NLO and NNLO parton distribution functions
is obtained.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
