Revisiting inclusive production of J/ψ and Υ in high-energy γγ collisions

The impact of Next-to-Leading Order (NLO) QCD corrections to the differential distributions of J/ψ and Υ mesons produced inclusively in γγ collisions is discussed for the kinematical conditions of LEP II for DELPHI and at the future Circular Electron-Positron Collider (CEPC). We take into account all sizeable contributions at LO in v² in NRQCD factorisation: 1) pure QED process γ + γ → J/ψ(³S[1]₁) + γ up to α³αₛ, 2) single-resolved-photon contributions up to αₛ⁴, 3) γ+γ→ J/ψ + cc̄ up to α²αₛ and 4) γ+γ→ J/ψ + ggg up to α²αₛ³. We will also discuss the pure QED process as a contribution to the exclusive production in ultra-peripheral heavy-ion collisions (UPC) at the LHC.