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New parton distributions from large-x and low-Q^2 data

Authors
  • Accardi, A.
  • Christy, M. E.
  • Keppel, C. E.
  • Melnitchouk, W.
  • Monaghan, P.
  • Morfin, J. G.
  • Owens, J. F.
Type
Published Article
Publication Date
Jan 26, 2010
Submission Date
Nov 11, 2009
Identifiers
DOI: 10.1103/PhysRevD.81.034016
Source
arXiv
License
Yellow
External links

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.

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