“…For phenomenological studies, single J/ψ inclusive cross sections as functions of the transverse momentum p T are preferred because a positive definite p T gives rise to a natural choice of the hard scale as p T or m T = p 2 T + m 2 J/ψ , where m J/ψ is the J/ψ mass. The measured p T -differential cross sections include the processes e + e − → J/ψ + X by the Belle experiment at KEKB [7], e + e − → e + e − + J/ψ + X (two-photon scattering) by DELPHI at LEP II [8], ep → J/ψ + X (photoproduction) by H1 and Zeus at HERA [9,10,11], and the hadroproduction p p → J/ψ + X by CDF at Tevatron [12,13], pp → J/ψ + X by PHENIX and STAR at RHIC [14,15], and by CMS [16,17,18,19], ATLAS [20,21], ALICE [22,23,24,25], and LHCb [26,27,28] experiments at the LHC. The SDCs for these processes have been computed to next-to-leading order (NLO) in α s [29,30,31,32,33,34,35,36,37].…”