Scaling patterns of the suppression of ${\pi }^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP

Abstract

Suppression measurements for neutral pions (${\pi }^0$) are used to investigate the predicted path length ($L$) and transverse momentum ($p_T$) dependent jet quenching patterns of the hot QCD medium produced in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. The observed scaling patterns show the predicted trends for jet-medium interactions dominated by radiative energy loss. They also allow simple estimates of the transport coefficient $\hat{q}$ and the ratio of viscosity to entropy density $\eta /s$. These estimates indicate that the short mean free path ($\lambda$) in the QCD medium leading to hydrodynamic-like flow with a small value of $\eta /s$, is also responsible for the strong suppression observed.

arXiv commentpublished version

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• Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics
• Shear viscosity of the Quark-Gluon Plasma from a virial expansion
• Azimuthal anisotropy: transition from hydrodynamic flow to jet suppression
• Universal scaling dependence of QCD energy loss from data driven studies
• Glauber-based evaluations of the odd moments of the initial eccentricity relative to the even order participant planes
• Scaling Behavior of the Azimuthal and Centrality Dependencies of Jet Production in Heavy-ion Collisions