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arXiv 2011.04546nucl-thnucl-ex
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A first estimate of $η/s$ in Au+Au reactions at E$_{\rm lab}=1.23$ $A$GeV

Tom Reichert, Gabriele Inghirami, Marcus Bleicher

英文摘要:

The HADES experiment at GSI has recently provided data on the flow coefficients $v_1,...,v_4$ for protons in Au+Au reactions at $E_{\rm lab} = 1.23$~$A$GeV (or $\sqrt{s_\mathrm{NN}}=2.4$ GeV). This data allows to estimate the shear viscosity over entropy ratio, $η/s$ at low energies via a coarse graining analysis of the UrQMD transport simulations of the flow harmonics in comparison to the experimental data. By this we can provide for the first time an estimate of $η/s\approx0.65\pm0.15$ (or $(8\pm2)\,(4π)^{-1}$) at such low energies.

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