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Probing quark orbital angular momentum at EIC and EicC

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arxiv 2312.01309 v2 pith:ESF7KDU4 submitted 2023-12-03 hep-ph

Shohini Bhattacharya , Duxin Zheng , Jian Zhou This is my paper · ORCID
classification hep-ph
keywords quarkangularmomentumcorrelationeiccorbitalprotonaccessible
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abstract

We propose to detect signals from quark orbital angular momentum (OAM) through exclusive $\pi^0$ production in electron-(longitudinally-polarized) proton collisions. Our analysis demonstrates that the $\sin 2\phi$ azimuthal angular correlation between the transverse momentum of the scattered electron and the recoil proton serves as a sensitive probe of quark OAM. Additionally, we present a numerical estimate of the asymmetry associated with this correlation for the kinematics accessible at EIC and EicC. This study aims to pave the way for the first experimental study of quark OAM in relation to the Jaffe-Manohar spin sum rule.

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Cited by 4 Pith papers

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  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. Gluon Generalized TMD signatures at the EIC from exclusive heavy (axial-)vector meson production

    hep-ph 2026-01 conditional novelty 6.0 of 10

    Exclusive heavy vector-meson electroproduction can yield cos2φ and sin2φ azimuthal asymmetries whose coefficients contain moments of gluon GTMDs F_{1,4} and G_{1,1}.

  3. QED nuclear medium effects at EIC energies

    nucl-th 2025-02 conditional novelty 5.0 of 10

    QED interactions between electrons and the screened Coulomb field of a lead nucleus produce percent-level corrections to elastic and inclusive deep-inelastic scattering rates at EIC energies.

  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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