Large-$P_T$ inclusive photoproduction of $J/\psi$ in electron-proton collisions at HERA and the EIC

Carlo Flore (1) , Jean-Philippe Lansberg (1) , Hua-Sheng Shao (2) , Yelyzaveta Yedelkina (1)

1 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2 LPTHE - Laboratoire de Physique Théorique et Hautes Energies

We study the inclusive J/ψ 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- PT leading- v next-to-leading αs corrections. In particular, we consider the contribution from J/ψ 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 PT within the reach of the EIC. In turn, we use our computation of J/ψ+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 .

Mots clés: J/ψ; ep reactions; photoproduction; HERA; EIC; Photoproduction; [formula omitted]; J/psi(3100): photoproduction; quarkonium: photoproduction; photon: off-shell; quantum electrodynamics: correction; charm; transverse momentum: high; nonperturbative; DESY HERA Stor; sensitivity; electron p: colliding beams; eRHIC

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique des Hautes Energies - Expérience [hep-ex]; Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

Carlo Flore, Jean-Philippe Lansberg, Hua-Sheng Shao, Yelyzaveta Yedelkina. Large-$P_T$ inclusive photoproduction of $J/\psi$ in electron-proton collisions at HERA and the EIC. Phys.Lett.B, 2020, 811, pp.135926. ⟨10.1016/j.physletb.2020.135926⟩. ⟨hal-02959552⟩