Constraints on spin-dependent parton distributions at large x from global QCD analysis

Journal Article · Sat Nov 01 00:00:00 EDT 2014 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2014.09.049· OSTI ID:1198368

Jimenez-Delgado, P.; Avakian, H.; Melnitchouk, W.

This study investigate the behavior of spin-dependent parton distribution functions (PDFs) at large parton momentum fractions x in the context of global QCD analysis. We explore the constraints from existing deep-inelastic scattering data, and from theoretical expectations for the leading x → 1 behavior based on hard gluon exchange in perturbative QCD. Systematic uncertainties from the dependence of the PDFs on the choice of parametrization are studied by considering functional forms motivated by orbital angular momentum arguments. Finally, we quantify the reduction in the PDF uncertainties that may be expected from future high-x data from Jefferson Lab at 12 GeV.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: Jefferson Lab Angular Momentum (JAM) Collaboration
• Grant/Contract Number: AC05-06OR23177
• OSTI ID: 1198368
• Alternate ID(s): OSTI ID: 1158670
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 738 Journal Issue: C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS