Revisiting NLO QCD corrections to total inclusive J/psi and gamma photoproduction cross sections in lepton-proton collisions

We revisit inclusive J/psi and gamma photoproduction at lepton-hadron colliders, namely in the limit when the exchanged photon is quasi real. Our computation includes the next-to-leading-order (NLO) alpha(s) corrections to the leading-order contributions in v. Similarly to the case of NLO charmonium-hadroproduction processes, the resulting cross sections obtained in the (MS) over bar factorisation scheme are sometimes found to be negative. We show that the scale-fixing criterion which we derived in a previous study of eta(c) production successfully solves this problem from the EicC all the way up to the FCC-eh energies. We then elaborate on how to study a scale uncertainty akin to that derived by scale variations when one fixes a scale. In turn, we investigate where both J/psi and gamma photoproduction could be used to improve our knowledge of gluon content of the proton at scales as low as a couple of GeV. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).