Oliva, L. and Fan, W. and Moreau, P. and Bass, S.A. (2025) Non-equilibrium effects and spherocity in relativistic proton-nucleus collisions. Il nuovo cimento C, 48 (1). pp. 1-8. ISSN 1826-9885
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Abstract
We examine non-equilibrium dynamics in proton-nucleus collisions at LHC energy by comparing the Parton-Hadron-String-Dynamics (PHSD) transport approach with the (2+1)dimensional viscous hydrodynamic model VISHNew. The latter is initialized with initial conditions extracted from PHSD. We observe that PHSD exhibits highly inhomogeneous energy density profiles on the transverse plane throughout the evolution, while VISHNew efficiently smooths initial spatial irregularities yet maintains significant inhomogeneity due to the smaller space-time size of the medium produced in small systems compared to heavy-ion reactions. The two approaches present also a very different evolution of the bulk viscous pressure. Furthermore, we analyze transverse spherocity distribution in PHSD and the hybrid approach (VISHNew + hadronic afterburner). We find a shift towards isotropic event configurations in PHSD compared to the result of the hybrid model. This dis similarity should primarily arise from the different descriptions of the medium within the two frameworks. We support the utility of multi-differential measurements based on multiplicity and spherocity selection for studying final-state observables in relativistic proton-nucleus collisions.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 24 Mar 2025 15:19 |
| Last Modified: | 24 Mar 2025 15:19 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23483 |
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