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

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

2009-11-11

arxiv.org/abs/0911.2254v2

Phys.Rev.D81:034016,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 8 figures. Minor corrections. References added. To appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.81.034016

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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