Relativistic corrections to exclusive photoproduction of Quarkonia near-threshold
Sarah K. Blask, Sean Fleming, Thomas Mehen, Jyotirmoy Roy, Iain W. Stewart, Fanyi Zhao
TL;DR
This paper calculates significant relativistic corrections to the exclusive photoproduction of vector Quarkonia near the threshold using NRQCD and GPD framework, comparing results with experimental data.
Contribution
It introduces a detailed calculation of relativistic corrections within NRQCD for near-threshold Quarkonia photoproduction, highlighting their importance and the presence of endpoint divergences.
Findings
Relativistic corrections are large for J/ψ.
Calculated cross-sections for J/ψ and Υ, with J/ψ data comparison.
Endpoint divergences occur away from the near-threshold regime.
Abstract
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 . Cross-sections for both and 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.
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