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  • Open Access

sin(2ϕ) azimuthal asymmetry in exclusive π0 production

Chentao Tan and Zhun Lu*

  • *Contact author: zhunlu@seu.edu.cn
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Phys. Rev. D 114, 054040 – Published 18 September, 2026

DOI: https://doi.org/10.1103/gqwx-dk7f

Abstract

The sin(2ϕ) azimuthal angular correlation between the transverse momenta of the scattered electron and the recoil proton in the ep→e′p′π0 process provides a probe for quark orbital angular momentum. We numerically calculate this asymmetry for the future Electron-Ion Collider (EIC) in the U.S. and China (EicC) kinematics using a light-front quark-scalar-diquark model, in which the light-front wave functions are derived from the soft-wall AdS/QCD framework. We also investigate the properties of the valence quark angular momentum expressed in terms of helicity-independent and helicity-dependent parton distributions. This study aims to establish theoretical constraints on the asymmetry sensitive to the quark orbital angular momentum prior to its first experimental measurement.

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Phys. Rev. D 114, 054040– Published 18 September, 2026
  • Received 20 August 2025
  • Accepted 3 September 2026
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