Nuclear Physics a a Detailed Study and Synthesis of Flow Observables in the Ip-glasma+music+urqmd Framework

In this work we use the IP-Glasma+MUSIC+UrQMD framework to systematically study a wide range of hadronic flow observables at 2.76 TeV. In addition to the single particle spectra and anisotropic flow coefficients v n previously studied in [1], we consider event-plane correlations, non-linear response coefficients χ npq , and event shape engineering. Taken together, these observables provide a wealth of insight into the collective behavior of the QGP and initial state fluctuations. They shed light on flow fluctuations, flow at fixed system size but different initial geometries, as well as the non-linear hydrodynamic response to the initial state spatial eccentricities. By synthesizing this information we can gain further insight into the transport properties of the QGP as well as the fluctuation spectrum of the initial state.


McDonald
Same parametrization achieves good agreement for both energies Nearly identical initial state eccentricities for two energies →increased v n 's due to increased lifetime of fireball 10 -2 10 -1 10 0 10 1 This fixes the system size, isolates shape. Still see spread, now with some correlation.
This fixes the system size, isolates shape. Still see spread, now with some correlation.
This fixes the system size, isolates shape. Still see spread, now with some correlation. The trends are reproduced but magnitudes are slightly off This fixes the system size, isolates shape. Still see spread, now with some correlation.
This fixes the system size, isolates shape. Still see spread, now with some correlation. The trends are reproduced but magnitudes are slightly off This fixes the system size, isolates shape. Still see spread, now with some correlation.
This fixes the system size, isolates shape. Still see spread, now with some correlation.

Not shown
Disentangle initial state and hydrodynamic response χ n characterizes the strength of the non-linear response χ n dependent on initial state? Sensitive to QGP parameters (η/S, ζ/S)?

Conclusion
There are several key elements in our model: initial state fluctuations hydrodynamics with shear + bulk viscosities hadronic afterburner proper centrality selection.
Our model achieves good agreement with many observables Clear opportunities to further constrain QGP parameters, initial state: ESE, "boomerang", χ n →η/s, ζ/s higher order v n 's, linear response →refine initial state Zooming out and looking at "totality" of flow observables simultaneously gives more rigorous constraints on initial state and QGP transport coefficients

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Verifying the non-linear response framework