Single and pair $J/\psi$ production in the Improved Color Evaporation Model using the Parton Reggeization Approach

Abstract

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

arXiv comment20 pages, 14 figures, 1 table

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• Associated production of heavy quarkonium and $D-$meson in the improved color evaporation model with KaTie
• Production of $S$-wave charmonia in the soft gluon resummation approach using the NRQCD
• Associated production of $J/\psi$ and direct photon in the NRQCD and the ICEM using the high-energy factorization
• Pair production of heavy quarkonia in the color evaporation model
• $J/\psi$ production at NLO with a scale-dependent color-evaporation model
• Associated production of $J/\psi$ plus $Z(W)$ in the improved color evaporation model using the parton Reggeization approach
• Charmonium pair production at the LHCb in the ICEM using the $k_T$-factorization: DPS versus SPS