Photoproduction of ηc,b near threshold

Apr 4, 2024
25 pages
Published in:
  • Phys.Rev.D 110 (2024) 5, 054025
  • Published: Sep 1, 2024
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Abstract: (APS)
We analyze the photoproduction of ηc,b off a proton in the threshold region, in terms of C-odd gluonic correlations in the off-forward proton matrix element. Near threshold, the skewness is large, leading to a production amplitude that is dominated by four C-odd twist-3 gluon GPDs. We use the QCD instanton vacuum to estimate these C-odd contributions in the proton. The results are used to estimate the differential cross sections for coherent photoproduction of ηc,b in the threshold region, at current electron facilities.
Note:
  • 25 pages, 9 figures
  • eta/c(2980): photoproduction
  • eta/b: photoproduction
  • charge conjugation
  • quantum chromodynamics: instanton
  • coherence
  • generalized parton distribution
  • higher-twist
  • twist: 3
  • differential cross section: calculated
  • gluon: correlation