期刊
PHYSICS LETTERS B
卷 742, 期 -, 页码 117-125出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2015.01.021
关键词
Parton distribution functions (PDFs); Polarized nucleon structure; Regge theory; Hadron models
资金
- Italian Ministry of Education, Research and Universities PRIN grant
- European Investment Bank EIBURS grant
I investigate the behavior of spin-dependent parton distribution functions in the regions of small and large momentum fractions x. I present a systematic comparison between predictions for relevant observables obtained with various models of nucleon spin structure and a recent global analysis of spin-dependent distributions, NNPDFpol1.1. Together with its unpolarized counterpart, NNPDF2.3, they form a mutually consistent set of parton distributions. Because they include most of the available experimental information, and are determined with a minimally biased methodology, these are especially suited for such a study. I show how NNPDFpol1.1 can discriminate between different theoretical models, even though NNPDF uncertainties remain large near the endpoints x -> 0 and x -> 1, due to the lack of experimental information. I discuss how our knowledge of nucleon spin structure may be improved at small x by future measurements at an Electron-Ion Collider, and at large x by recent measurements at Jefferson Lab, also in view of its 12 GeV upgrade. (C) 2015 The Author. Published by Elsevier B.V.
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