Relativistic corrections to exclusive photoproduction of Quarkonia near-threshold
A bstract Non-relativistic QCD (NRQCD) is used to calculate the relativistic correction to the amplitude for exclusive photoproduction of vector Quarkonia in the near-threshold region within the generalized parton distribution (GPD) framework. The relativistic corrections are found to be large for J / ψ , and lead to a breakdown of the GPD moment expansion near threshold. Cross-sections for both J / ψ and Υ are calculated with the former being compared to the data. We also demonstrate the presence of endpoint divergences for the relativistic correction away from the near-threshold regime.
Authors
- Thomas Mehen (ORCID: https://orcid.org/0000-0001-7725-4488)
- F. Zhao (ORCID: https://orcid.org/0000-0002-8369-4380)
- Jyotirmoy Roy (ORCID: https://orcid.org/0000-0002-4574-5386)
- Sean Fleming (ORCID: https://orcid.org/0000-0002-9553-7198)
- Iain W. Stewart (ORCID: https://orcid.org/0000-0003-0248-0979)
- Sarah K. Blask (ORCID: https://orcid.org/0009-0005-2058-0203)
Institutions
- University of Arizona (US)
- Duke University (US)
- Massachusetts Institute of Technology (US)
Publication Details
- Journal
- Journal of High Energy Physics
- Published
- 2026-06-25
- DOI
- https://doi.org/10.1007/jhep06(2026)250
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- Simons Foundation
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Office of Science
- Deutsches Elektronen-Synchrotron
- Nuclear Physics