Iterative Monte Carlo analysis of spin-dependent parton distributions

We present a comprehensive new global QCD analysis of polarized inclusive deep-inelastic scattering, including the latest high-precision data on longitudinal and transverse polarization asymmetries from Jefferson Lab and elsewhere. The analysis is performed using a new iterative Monte Carlo fitting...

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Bibliographic Details
Published in:Physical review. D 2016-04, Vol.93 (7), Article 074005
Main Authors: Sato, Nobuo, Melnitchouk, W., Kuhn, S. E., Ethier, J. J., Accardi, A.
Format: Article
Language:English
Subjects:
Asymmetry
Cosmology
Monte Carlo methods
Nucleons
Partons
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Polarization
Portable document format
Uncertainty
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Summary:We present a comprehensive new global QCD analysis of polarized inclusive deep-inelastic scattering, including the latest high-precision data on longitudinal and transverse polarization asymmetries from Jefferson Lab and elsewhere. The analysis is performed using a new iterative Monte Carlo fitting technique which generates stable fits to polarized parton distribution functions (PDFs) with statistically rigorous uncertainties. Inclusion of the Jefferson Lab data leads to a reduction in the PDF errors for the valence and sea quarks, as well as in the gluon polarization uncertainty at x> or =0.1. The study also provides the first determination of the flavor-separated twist-3 PDFs and the d sub(2) moment of the nucleon within a global PDF analysis.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.074005