Sprecher
Beschreibung
Hybrid models are used to describe the evolution of the quark-gluon plasma produced in ultrarelativistic heavy-ion collisions. These models combine viscous relativistic hydrodynamics with pre-equilibrium dynamics and hadronic cascade models. The connection from the hydrodynamics stage to the particlization stage is made through a particlization model, based on the Cooper-Frye formalism. This stage is responsible for translating the hydrodynamics continuous degrees of freedom to the discrete degrees of freedom of a hadron resonance gas. In this project, we analyse the numerical implementation of a new relaxation time approximation (RTA) based viscous correction to the Cooper-Frye formalism using the iSS particlization model, focusing on its impact on final observables of heavy-ion collisions. An important parameter $\gamma$ appears in the new RTA; it is a new free parameter that can be used to better describe these final observables. We investigate how varying values of $\gamma$ affect particle spectra and yields. The analysis was performed for PbPb collisions using parameters from a Bayesian study from the JETSCAPE collaboration and for pPb collisions with parameters based on results by the Duke group. We saw that while the multiplicity of charged particles and the average transverse momentum of the total charged particles remain largely unaffected, a significant dependence on $\gamma$ is observed when analyzing the identified particle yields. These results highlight the importance of a detailed treatment of viscous corrections in improving the precision of hybrid model predictions.
