NNLO Global Analysis of Polarized Parton Distribution Functions

Abstract

We present a next-to-next-to-leading order (NNLO) global QCD analysis of the proton's helicity parton distribution functions (PDFs), the first of its kind. To obtain the distributions, we use data for longitudinal spin asymmetries in inclusive and semi-inclusive lepton-nucleon scattering as well as in weak-boson and hadron or jet production in proton-proton scattering. We analyze the data using QCD perturbation theory at NNLO accuracy, employing approximations provided by the threshold resummation formalism in cases where full NNLO results for partonic hard-scattering functions are not readily available. Our numerical results suggest a remarkable perturbative stability of the extracted helicity PDFs.

5 pages, 5 figures; v3: published version, added link to PDFs repository

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Cited by in corpus (7)

• Polarized semi-inclusive deep-inelastic scattering at NNLO in QCD
• NNLO QCD corrections to unpolarized and polarized SIDIS
• Deep-Inelastic Scattering at TeV Energies with LHC Muons
• Single-valued representation of unpolarized and polarized semi-inclusive deep inelastic scattering at next-to-next-to-leading order
• Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements
• Determination of the pion generalized parton distributions at zero skewness
• The Unresolved Behaviour of Polarized Scattering Matrix Elements at NNLO in QCD