11th workshop of the APS Topical Group on Hadronic Physics

Exploring the role of the pre-equilibrium phase in determining nuclear geometry in high-energy collisions

Not scheduled

20m

parallel

Speaker

Kevin Possendoro Pala (University of Illinois Urbana-Champaign)

Description

Ultrarelativistic isobar collisions serve as a powerful tool for probing nuclear structures. These high-energy collisions are typically described by a hydrodynamic expansion, preceded by a pre-thermal equilibrium phase. However, due to the computational complexity of hydrodynamic simulations, studies of isobar nuclear structures often rely on geometrical estimators, such as eccentricities, while neglecting the pre-thermal phase. In this presentation, we study the impact of a free-streaming phase on observables and point out some for which it is relevant. The discussion in terms of geometrical estimators follows arXiv:2305.03703v3. Furthermore, we present initial results from full hydrodynamic simulations to assess the geometric estimators that were used