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PreprintCC BY-NC-ND 4.0arXiv

Twist-3 gluon GPDs for the nucleon in a spectator model

  • Chentao Tan
  • Zhun Lu
Open at sourcePDFDOICite

Abstract

We investigate the complete set of twist-3 gluon generalized parton distributions (GPDs) of the nucleon at nonzero skewness within a spectator model, in which the nucleon is treated as a two-body system consisting of an active spin-1 gluon and a spin-1/2 spectator particle. The spectator mass is allowed to vary continuously and is described by a spectral function, while the nucleon-gluon-spectator coupling is modeled by an effective vertex containing two form factors. We calculate the twist-3 gluon GPDs over a broad kinematic range and investigate the corresponding impact-parameter-dependent parton distributions, defined as two-dimensional Fourier transforms of the GPDs at zero skewness. In the forward limit, we further obtain the corresponding twist-3 parton distribution functions (PDFs). Our results provide model predictions for twist-3 gluon GPDs and PDFs that can be useful for future phenomenological studies and for investigating observables at current and future collider facilities.

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Cite

BibTeXRIS
BibTeX
@misc{tan2026twist3,
  title = {{Twist-3 gluon GPDs for the nucleon in a spectator model}},
  author = {Chentao Tan and Zhun Lu},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.18427},
  eprint = {2609.18427},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.18427},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Twist-3 gluon GPDs for the nucleon in a spectator model
AU  - Chentao Tan
AU  - Zhun Lu
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.18427
UR  - https://arxiv.org/abs/2609.18427
AB  - We investigate the complete set of twist-3 gluon generalized parton distributions (GPDs) of the nucleon at nonzero skewness within a spectator model, in which the nucleon is treated as a two-body system consisting of an active spin-1 gluon and a spin-1/2 spectator particle. The spectator mass is allowed to vary continuously and is described by a spectral function, while the nucleon-gluon-spectator coupling is modeled by an effective vertex containing two form factors. We calculate the twist-3 gluon GPDs over a broad kinematic range and investigate the corresponding impact-parameter-dependent parton distributions, defined as two-dimensional Fourier transforms of the GPDs at zero skewness. In the forward limit, we further obtain the corresponding twist-3 parton distribution functions (PDFs). Our results provide model predictions for twist-3 gluon GPDs and PDFs that can be useful for future phenomenological studies and for investigating observables at current and future collider facilities.
ER  -