Perspective on polarised parton distribution functions and proton spin

Cheng, Peng; Yu, Y.; Xing, H.; Chen, Ch.; Cui, Zhu-Fang; Roberts, C. D.

doi:10.1016/j.physletb.2023.138074

Cited by 6 publications

(1 citation statement)

References 86 publications

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“…They correspond to the CSM predictions in Ref. [64] after accounting for extrapolation of ∫︀ 1 𝑥 0 𝑑𝑥Δg𝑝(𝑥; 𝜁) to 𝑥0 = 0. The result is somewhat larger than that obtained via Eq.…”

Section: (4b)supporting

confidence: 81%

All-Orders Evolution of Parton Distributions: Principle, Practice, and Predictions

Yin

Cui

et al. 2023

Chinese Phys. Lett.

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Parton distribution functions (PDFs) are defining expressions of hadron structure. Exploiting the role of effective charges in quantum chromodynamics, an algebraic scheme is described which, given any hadron’s valence parton PDFs at the hadron scale, delivers predictions for all its PDFs - unpolarised and polarised - at any higher scale. The scheme delivers results that are largely independent of both the value of the hadron scale and the pointwise form of the charge; and, inter alia, enables derivation of a model-independent identity that relates the strength of the proton’s gluon helicity PDF, △G ζ p , to that of the analogous singlet polarised quark PDF and valence quark momentum fraction. Using available data fits and theory predictions, the identity yields △G p (ζ C = √3GeV) = 1.48(10). It furthermore entails that the measurable quark helicity contribution to the proton spin is ã ζC 0p = 0.32(3), thereby reconciling contemporary experiment and theory.

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Section: (4b)supporting

confidence: 81%

All-Orders Evolution of Parton Distributions: Principle, Practice, and Predictions

Yin

Cui

et al. 2023

Chinese Phys. Lett.

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Pseudoscalar Mesons and Emergent Mass

Raya,

Bashir,

Binosi

et al. 2024

Few-Body Syst

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Despite its role in the continuing evolution of the Universe, only a small fraction of the mass of visible material can be attributed to the Higgs boson alone. The overwhelmingly dominant share may/should arise from the strong interactions that act in the heart of nuclear matter; namely, those described by quantum chromodynamics. This contribution describes how studying and explaining the attributes of pseudoscalar mesons can open an insightful window onto understanding the origin of mass in the Standard Model and how these insights inform our knowledge of hadron structure. The survey ranges over distribution amplitudes and functions, electromagnetic and gravitational form factors, light-front wave functions, and generalized parton distributions. Advances made using continuum Schwinger function methods and their relevance for experimental efforts are highlighted.

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