Speaker
Description
We study the prompt single and double $J/\psi$ hadroproduction in the Improved Color
Evaporation Model using the Parton Reggeization Approach. We make calculations in a single manner to described the experimental data for prompt $J/\psi$ transverse momentum spectra from the energy of $\sqrt{s}=19$ GeV up to modern energy of the LHC, $\sqrt{s}=13$ TeV. The numerical calculations are doing using parton-level MC generator for $k_T-$depended initial-state partons, KaTie. We use the modified KMR-type unintegrated parton distribution functions of Reggeized gluons and quarks with exact normalization based on Kimber-Martin-Ryskin-Watt model. We suggest improvement of the ICEM for the pair-production of $J/\psi$. In case of double $J/\psi$ production we investigate the relative contributions of the single-parton scattering and double-parton scattering mechanisms.
