Charged-particles distribution in proton–proton and heavy-ion collisions using PYTHIA8 Angantyr model at LHC energies
High Energy Nuclear & Particle Physics Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, 700064, Kolkata, India
2 Variable Energy Cyclotron Centre (VECC), HBNI, 1/AF Bidhannagar, 700064, Kolkata, India
Accepted: 27 November 2022
Published online: 9 December 2022
We have performed the production of primary charged-particles in systems: pp ( = 0.9, 2.76, 5.02, 7 and 13 TeV), Xe–Xe ( = 5.44 TeV) and Pb–Pb ( = 2.76 and 5.02 TeV) using Angantyr model in PYTHIA8 with default settings. The production of charged-particles has been measured at mid-rapidity 0.8 as a function of transverse momentum (p) for p–p and heavy-ion collisions and contrasted with available ALICE data. The default settings in the model add the multiple-parton interaction based color reconnection (CR) mechanism to make an agreement with collectivity encoded in the published ALICE data, especially in p–p collisions. The results of average transverse momentum () as a function of charged-particle multiplicity () at mid-rapidity 0.3 ( GeV/c) show the collective effect in p–p collision. The same observable is studied in heavy-ion collisions. Here, the effect of CR mechanism has been demonstrated in the qualitative evolution of the spectral shapes. In addition to the particle spectra, the observable nuclear modification factor (R) is studied for center-of-mass energies = 2.76 and 5.02 TeV in Pb–Pb collisions. The R versus spectra show that ALICE data overestimate the simulated R results after p 15 GeV/c for both the energies. Lastly, the predictions are given for the charged-particles -distribution at four centrality classes and versus in O–O collision at = 6.37 TeV.
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