| Abstrakt: |
The Large Hadron Collider (LHC) aims to inject oxygen (16O) ions in the next run into its experiments. This include the anticipated one-day physics run focusing on O + O collisions at center-of-mass energy s NN = 7 TeV. In this study, we have used recently developed version of the EPOS (EPOS4) to study the production of identified particles ( π ± , K ± and p (p ¯) ) in O + O collisions at s NN = 7 TeV. Predictions of transverse momentum ( p T ) spectra, ⟨ p T ⟩ , integrated yield ( d N / d y ) for different centrality classes are studied. To provide insight into the collective nature of the produced particles, we look into the p T -differential particle ratios ( K / π and p / π ) and p T -integrated particle ratios to ( π + + π - ) as a function of charge particle multiplicity. The shape of the charge particle multiplicity ( d N ch / d η ) and mean transverse momentum ( ⟨ p T ⟩ ) is well described by EPOS4. The predictions for the ratios of K / π and p / π from EPOS4 exhibit a systematic overestimation compared to the trends observed in p + p , p + P b and P b + P b systems as a function of charged-particle multiplicity. Interestingly, the O + O results of p T -integrated particle ratios shows a clear final state multiplicity overlap with p + p , p + P b and P b + P b collisions. EPOS4 does not only mimics signs of collectivity, but embeds collective expansion by construction, since it relies on relativistic hydrodynamics to model the evolution of the so-called core and is one of the suitable candidates to study ultra-relativistic heavy-ion collisions. Furthermore, the foreseen data from O + O collisions at the LHC, when available, will help to better understand the heavy-ion-like behavior in small systems as well as help to put possible constraints on the model parameters. [ABSTRACT FROM AUTHOR] |
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