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Transversity generalized parton distributions of the Δ with the diquark spectator model

Dongyan Fu1,*, Yubing Dong2,3,†, and S. Kumano1,4,5,‡

  • *Contact author: fudongyan@impcas.ac.cn
  • †Contact author: dongyb@ihep.ac.cn
  • ‡Contact author: kumanos@impcas.ac.cn
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Phys. Rev. D 112, 096027 – Published 24 November, 2025

DOI: https://doi.org/10.1103/d17w-jkr8

Abstract

We show quark transversity generalized parton distributions (GPDs) of the Δ+ isobar by using the diquark spectator model for the first time. First, this model is tested by electric charge, magnetic-dipole, and axial charge form factors, and it is used for calculating the transversity GPDs H1,3,5,7qT of Δ+. The quark transversity distribution h1 is then obtained from the transversity GPDs in the forward limit. Then, helicity-flip amplitudes are shown numerically by using relations between the helicity amplitudes and the GPDs. Finally, by taking first moments of the GPDs, tensor form factors are obtained and we predict the tensor charge. Experimentally, N−Δ transition GPDs are investigated in deeply virtual Compton scattering and virtual meson-production processes, and generalized distribution amplitudes, which correspond to the s-channel GPDs, could be investigated by the two-photon processes γ*γ→ΔΔ¯ at the electron-positron colliders. Therefore, the spin-3/2 Δ GPDs could become interesting quantities experimentally in the future.

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Phys. Rev. D 112, 096027– Published 24 November, 2025
  • Received 25 August 2025
  • Accepted 31 October 2025
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