New parton distributions from large-x and low-Q^2 data
Abstract
We report results of a new global next-to-leading order fit of parton distribution functions in which cuts on W and Q are relaxed, thereby including more data at high values of x. Effects of target mass corrections (TMCs), higher twist contributions, and nuclear corrections for deuterium data are significant in the large-x region. The leading twist parton distributions are found to be stable to TMC model variations as long as higher twist contributions are also included. The behavior of the d quark as x-->1 is particularly sensitive to the deuterium corrections, and using realistic nuclear smearing models the d-quark distribution at large x is found to be softer than in previous fits performed with more restrictive cuts.
Cite
@article{arxiv.0911.2254,
title = {New parton distributions from large-x and low-Q^2 data},
author = {A. Accardi and M. E. Christy and C. E. Keppel and W. Melnitchouk and P. Monaghan and J. G. Morfin and J. F. Owens},
journal= {arXiv preprint arXiv:0911.2254},
year = {2010}
}
Comments
31 pages, 8 figures. Minor corrections. References added. To appear in Phys.Rev.D