Revisiting inclusive production of J/psi and Upsilon in high-energy gamma-gamma collisions
Abstract
The impact of Next-to-Leading Order (NLO) QCD corrections to the differential distributions of J/psi and Upsilon mesons produced inclusively in gamma-gamma 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 gamma + gamma -> J/psi(3S11) + γ up to alpha3 alphas, 2) single-resolved-photon contributions up to alphas4, 3) gamma+gamma -> J/psi + c c-bar up to alpha2 alphas and 4) gamma+gamma -> J/psi + ggg up to alpha2 alphas3. 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.
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