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Proton Spin Structure from Measurable Parton Distributions

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arxiv 1202.2843 v2 pith:ZOEYKT3X submitted 2012-02-13 hep-ph

Xiangdong Ji , Xiaonu Xiong , Feng Yuan This is my paper · ORCID
classification hep-ph
keywords distributionspartonmeasurableprotongeneralizedhelicityspinstructure
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We present a systematic study of the proton spin structure in terms of measurable parton distributions. For a transversely-polarizedproton, we derive a polarization sum rule from the leading generalized parton distributions appearing in hard exclusive processes. For a longitudinally-polarized proton, we obtain a helicity decomposition from well-known quark and gluon helicity distributions and orbital angular-momentum contributions. The latter is shown to be related to measurable subleading generalized parton distributions and quantum-phase space Wigner distributions.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 129 citations worldwide. Full citation record

  1. Parton distributions in the shockwave formalism

    hep-ph 2025-10 conditional novelty 7.0 of 10

    A single shockwave Feynman-rule framework reproduces and extends prior small-x parton distributions, yielding new quark GTMD/GPD/PDF and diffractive-TMD results.

  2. Mapping the transverse spin sum rule in position space

    hep-ph 2025-05 unverdicted novelty 6.0 of 10

    Derives relativistic spatial distributions of transverse orbital angular momentum, intrinsic spin, and total angular momentum in the transverse plane for spin-0 and spin-1/2 targets via quantum phase-space formalism a...

  3. Twist-3 generalized parton distributions of sea quarks at zero skewness in the light-cone quark model

    hep-ph 2025-04 conditional novelty 6.0 of 10

    A light-cone meson-baryon model is used to compute the eight nonzero twist-3 generalized parton distributions of ubar and dbar sea quarks at zero skewness, plus the derived e(x) and orbital angular momentum.

  4. Spin Structure of the Nucleon: Overview

    hep-ph 2026-07 unverdicted

    A pedagogical review consolidates the proton spin decomposition into quark/gluon spin and orbital angular momentum, emphasizing gauge-invariant OAM definitions, small-x cancellations, and EIC observables.

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