Early evolution constrained by high-$p_T$ QGP tomography

Abstract

We show that high-$p_T$ $R_{AA}$ and $v_2$ are sensitive to the early expansion dynamics, and that the high-$p_T$ observables prefer delayed onset of energy loss and transverse expansion. To calculate high-$p_T$ $R_{AA}$ and $v_2$, we employ our newly developed DREENA-A framework, which combines state-of-the-art dynamical energy loss model with 3+1-dimensional hydrodynamical simulations. The model applies to both light and heavy flavor, and we predict a larger sensitivity of heavy flavor observables to the onset of transverse expansion. This presents the first time when bulk QGP behavior has been constrained by high-$p_{\perp }$ observables and related theory, i.e., by so-called QGP tomography.

5 pages, 4 figures

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• Prompt and non-prompt J$/\psi$ production at midrapidity in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Jet-temperature anisotropy revealed through high-$p_{\perp }$ data
• Bayesian Constraints on Pre-Equilibrium Jet Quenching and Predictions for Oxygen Collisions