期刊
PHYSICAL REVIEW D
卷 81, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.034016
关键词
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资金
- DOE, Jefferson Science Associates [DE-AC05-06OR23177, DE-FG02-97ER41022]
- NSF [0653508]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0653508] Funding Source: National Science Foundation
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, 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 target mass correction 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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