Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 65: Heavy-Ion Collisions and QCD Phases XIII

HK 65.4: Talk

Thursday, March 31, 2022, 16:45–17:00, HK-H1

Precision hydrodynamic predictions for particle production in isobar collisions at RHIC — •Andreas Kirchner², Federica Capellino¹, Stefan Floerchinger², Giuliano Giacalone², and Eduardo Grossi³ — ¹Physikalisches Institut Heidelberg — ²ITP Heidelberg — ³IPhT Saclay

The STAR collaboration has recently released high precision measurements of soft particle production in Ru+Ru and Zr+Zr collisions permitting us to perform precision tests of hydrodynamic models of the quark-gluon plasma (QGP). In this contribution, we discuss hydrodynamic results for particle production in isobar collisions where we achieve the same precision reached in the experimental data. Our approach relies on a background-fluctuation splitting of the equations of hydrodynamics. We decompose the QGP as an event-averaged azimuthally-isotropic background plus an event-by-event fluctuation. We show that the leading contribution to the average final-state spectra are obtained from the 1+1D evolution of the isotropic background, which is very fast to run. We use, hence, FluiduM, a new solver for the 1+1D evolution of the QGP, to compute predictions for particle spectra, yields and average transverse momenta of identified hadrons. Looking at ratios of quantities between Ru+Ru and Zr+Zr systems, we find that they are insensitive to viscosities and other medium parameters. They are instead driven by initial-state effects driven mainly by the larger neutron skin of 96Zr.