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<p>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 <i>J</i>/<i>ψ</i>, and lead to a breakdown of the GPD moment expansion near threshold. Cross-sections for both <i>J</i>/<i>ψ</i> 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.</p>

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Relativistic corrections to exclusive photoproduction of Quarkonia near-threshold

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月25日

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  • Sarah K. Blask,
  • Sean Fleming,
  • Thomas Mehen,
  • Jyotirmoy Roy,
  • Iain W. Stewart,
  • Fanyi Zhao

摘要

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.