Associated ϒ + γ production at the LHC in the kt-factorization approach

In the framework of kt-factorization approach, the photon-associated production of ϒ mesons at the present-day LHC conditions is studied. The differential cross sections and polarization parameters are calculated in the ‘helicity’ and Collins-Soper systems. Special attention is paid to the effect of experimental cuts that can dramatically change the visible lepton angular distributions.