Physical Review D
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 > = 0.1. The study also provides the first determination of the flavor -separated twist - 3 PDFs and the d(2) moment of the nucleon within a global PDF analysis.
Sato, N., Melnitchouk, W., Kuhn, S. E., Ethier, J. J., Accardi, A., & Jefferson Lab Angular Momentum Collaboration. (2016). Iterative Monte Carlo analysis of spin-dependent parton distributions. Physical Review D, 93(7), 074005.