Production and polarization of direct $J/\psi$ to $\mathcal{O}({\alpha }_s^3)$ in the improved color evaporation model in collinear factorization

Abstract

We calculate the production and polarization of direct $J/\psi$ in the improved color evaporation model at $\mathcal{O}({\alpha }_s^3)$ in the collinear factorization approach. We present the first calculation of polarization parameters ${\lambda }_{\vartheta }$, ${\lambda }_{\varphi }$, and ${\lambda }_{\vartheta \varphi }$ in the helicity and the Collins-Soper frames, as well as the frame-invariant polarization parameter $\tilde{\lambda }$ as a function of transverse momentum. We find agreement with both $J/\psi$ cross sections and the invariant polarization parameters at small and moderate $p_T$.

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• The Present and Future of QCD
• Single and pair $J/\psi$ production in the Improved Color Evaporation Model using the Parton Reggeization Approach
• Energy Dependence of Intrinsic Charm Production: What is the Best Energy for Observation?
• Measurement of the production cross-section of $J/\psi$ and $\psi (2$S$)$ mesons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Associated production of heavy quarkonium and $D-$meson in the improved color evaporation model with KaTie
• Quarkonium polarization in Pb+Pb collisions in the improved color evaporation model
• Measurement of the polarizations of prompt and non-prompt J/$\psi$ and $\psi$(2S) mesons produced in pp collisions at $\sqrt{s}$ = 13 TeV
• $J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at energies available at the CERN Large Hadron Collider using PYTHIA8
• Contribution from Intrinsic Charm Production to Fixed-Target Interactions at the LHC
• Associated production of $J/\psi$ plus $Z(W)$ in the improved color evaporation model using the parton Reggeization approach
• $J/\psi$ photoproduction and polarization in $e+p$ collisions in the improved color evaporation model
• Charmonium pair production at the LHCb in the ICEM using the $k_T$-factorization: DPS versus SPS