Exclusive photoproduction of ϕ meson in γp→ϕp and pp→pϕp reactions

The amplitude for γp→ϕp is calculated in a pQCD kT-factorization approach. The total cross section for this process is compared with HERA data. Total cross section, as a function of photon-proton energy and photon virtuality, is calculated. We also discuss the ratio of σL/σT and the dependence on the mass of the strange quark. The amplitude for γp→ϕp is used to predict the cross section for exclusive photoproduction of ϕ meson in proton-proton collisions. Absorption effects are included. The results for RHIC, Tevatron and LHC energies are presented.