2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 13, 241-245
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 $R ={\sigma_L}/{\sigma_T}$

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

We report on the extraction of the higher twist contributions to F2 and $R ={\sigma_L}/{\sigma_T}$ 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