$J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at the LHC energies using PYTHIA8 - Archive ouverte HAL
Article Dans Une Revue Phys.Rev.C Année : 2024

$J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at the LHC energies using PYTHIA8

Bhagyarathi Sahoo
  • Fonction : Auteur
Dushmanta Sahu
  • Fonction : Auteur
Captain R Singh
  • Fonction : Auteur
Raghunath Sahoo
  • Fonction : Auteur

Résumé

The production mechanisms of charmonium states in both hadronic and heavy-ion collisions hold great significance for investigating the hot and dense QCD matter. Studying charmonium polarization in ultra-relativistic collisions can also provide insights into the underlying production mechanisms. With this motivation, we explore the $J/\psi$ and $\psi$(2S) polarization in proton+proton collisions at $\sqrt{s}$ = 7, 8, and 13 TeV using a pQCD-inspired Monte-Carlo event generator called PYTHIA8. This work considers reconstructed quarkonia through their dimuons decay channel in the ALICE forward rapidity acceptance range of $2.5 < y_{\mu \mu} < 4$. Further, we calculate the polarization parameters $\lambda_{\theta}$, $\lambda_{\phi}$, $\lambda_{\theta \phi}$ from the polar and azimuthal angular distributions of the dimuons in helicity and Collins-Soper frames. This study presents a comprehensive measurement of the polarization parameters as a function of transverse momentum, charged-particle multiplicity, and rapidity at the LHC energies. Our findings of charmonium polarization are in qualitative agreement with the corresponding experimental data.

Dates et versions

hal-04199215 , version 1 (07-09-2023)

Identifiants

Citer

Bhagyarathi Sahoo, Dushmanta Sahu, Suman Deb, Captain R Singh, Raghunath Sahoo. $J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at the LHC energies using PYTHIA8. Phys.Rev.C, 2024, 109 (3), pp.034910. ⟨10.1103/PhysRevC.109.034910⟩. ⟨hal-04199215⟩
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