Helicity Dependent Distribution Functions of the Proton and $Λ$ and $Σ^0$ Baryons

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Authors: Yang Yu, Peng Cheng, H. Xing, Daniele Binosi, Craig D. Roberts
Cited by: 0

Abstract

Using continuum Schwinger function methods, a coherent set of predictions for proton, $Λ$ and $Σ^0$ distribution functions (DFs) has been made available -- both helicity dependent and unpolarised. The results and comparisons between them reveal impacts of diquark correlations and SU$(3)$-flavour symmetry breaking, some of which are highlighted in this contribution. For instance: in-proton ratios of helicity-dependent/unpolarised valence-quark DFs are presented; it is highlighted that, were it not for the presence of axialvector diquarks in the $Σ^0$, the valence strange quark would carry none of the $Σ^0$ spin; and the sign and size of polarised gluon DFs is discussed -- at a scale typical of modern measurements, gluon partons carry roughly 40% of each octet baryon's spin.

Fields of Study & Subjects

Particle physics theoretical and experimental studies Quantum Chromodynamics and Particle Interactions Quantum and Classical Electrodynamics

Publication details

Journal / source
arXiv (Cornell University)
Publication date
5 January 2026
Document type
Preprint