Dynamics of identified particles production in oxygen-oxygen collisions at √sNN=7 TeV using EPOS4

The Large Hadron Collider (LHC) aims to inject oxygen (O-16) ions in the next run into its experiments. This include the anticipated one-day physics run focusing on O + Ocollisions at center-of-mass energy root s(NN )= 7 TeV . In this study, we have used recently developed version of the EPOS (EPOS4) to study the production of identified particles (pi(+/-), K(+/- )and p(p<overline>)) in O + Ocollisions at root s(NN )= 7 TeV . Predictions of transverse momentum (pT) spectra, < pT >, integrated yield (dN/dy) for different centrality classes are studied. To provide insight into the collective nature of the produced particles, we look into the pT-differential particle ratios (K/pi and p/pi) and pT-integrated particle ratios to (pi( + ) + pi(-)) as a function of charge particle multiplicity. The shape of the charge particle multiplicity (dNch/d eta) and mean transverse momentum (< pT >) is well described by EPOS4. The predictions for the ratios of K/pi and p/pi from EPOS4 exhibit a systematic overestimation compared to the trends observed in p + p, p + Pband Pb + Pbsystems as a function of charged-particle multiplicity. Interestingly, the O + Oresults of pT-integrated particle ratios shows a clear final state multiplicity overlap with p + p, p + Pband Pb + Pb 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 + Ocollisions 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.