Single and pair <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math> production in the improved color evaporation model using the parton Reggeization approach

In the article, we study single and pair $J/\psi$ hadroproduction in Improved Color Evaporation Model via Parton Reggeization Approach. The last one is based on $k_T$-factorization of hard processes multi-Regge kinematics, Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions, effective field theory Reggezied gluons quarks, suggested by L.N. Lipatov. We compare contributions from double scattering mechanisms production. numerical calculations are realized using Monte-Carlo event generator KaTie.