Iterative Monte Carlo analysis of spin-dependent parton distributions

Apr 13, 2016, 9:50 AM
SR4a (DESY Hamburg)


DESY Hamburg

Spin Physics WG6 Spin Physics


nobuo sato (jefferson lab)


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.

Primary authors

Alberto Accardi (Hampton University) Jacob Ethier (College of William and Mary) Sebastian Kuhn (Old Dominion University) Wally Melnitchouk (jefferson lab) nobuo sato (jefferson lab)

Presentation materials