A first estimate of η/s in Au+Au reactions at Elab = 1.23 AGeV

• DOI: 10.1016/j.physletb.2021.136285
• Publication Date: 2021-04-15T05:11:42Z
• Authors: Tom Reichert; Gabriele Inghirami; Marcus Bleicher
• Keywords: Granularity

The HADES experiment at GSI has recently provided data on the flow coefficients v1,...,v4 for protons in Au+Au reactions Elab=1.23AGeV (or sNN=2.4GeV). This allows to estimate shear viscosity over entropy density ratio, η/s low energies via a coarse graining analysis of UrQMD transport simulations harmonics comparison experimental data. By this we can provide first time an η/s≈0.65±0.15 (8±2)(4π)−1) such energies.