Аннотация:In the framework of ${k}_{t}$-factorization approach, we consider the production of $J/\ensuremath{\psi}$ pairs at the LHC conditions. We give predictions on the differential cross sections and discuss the source and the size of theoretical uncertainties. We also present a comparison with collinear parton model showing a dramatic difference in the $J/\ensuremath{\psi}$ transverse momentum spectrum and $J/\ensuremath{\psi}\ensuremath{-}J/\ensuremath{\psi}$ azimuthal correlations. Finally, we give predictions on the polarization observables in the helicity and Collins-Soper systems.
