期刊
PHYSICS LETTERS B
卷 811, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2020.135926
关键词
J/psi; ep reactions; Photoproduction; HERA; EIC
资金
- European Union's Horizon 2020 research and innovation programme [824093]
- French CNRS via the IN2P3 project GLUE@NLO
- French CNRS via Franco-Chinese LIA FCPPL (Quarkonium4AFTER)
- Paris-Saclay U. via the P2I Department
- P2IO Labex via the Gluodynamics project
- ILP Labex [ANR-11-IDEX-0004-02, ANR-10-LABX-63]
- EU Erasmus+ Paris-Saclay U.-Ukraine program
We study the inclusive J/psi production at large transverse momenta at lepton-hadron colliders in the limit when the exchange photon is quasi real, also referred to as photoproduction. Our computation includes the leading-P-T leading-nu next-to-leading alpha(s) corrections. In particular, we consider the contribution from J/psi plus another charm quark, by employing for the first time in quarkonium photoproduction the variable-flavour-number scheme. We also include a QED-induced contribution via an off-shell photon which remained ignored in the literature and which we show to be the leading contribution at high P-T within the reach of the EIC. In turn, we use our computation of J/psi + charm to demonstrate its observability at the future EIC and the EIC sensitivity to probe the non-perturbative charm content of the proton at high x. (C) 2020 The Authors. Published by Elsevier B.V.
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