Heavy quarks and the collective properties of hot QCD
Giorgio Torrieri, Jorge Noronha
TL;DR
This paper reviews how heavy quark measurements can provide insights into the fluid properties and equation of state of hot QCD matter created in ultrarelativistic collisions.
Contribution
It introduces new methods to constrain QCD matter viscosity and explores flavoring effects on flow observables to understand the system's equation of state.
Findings
Heavy quark spectra constrain QCD matter viscosity.
Correlations between flow and charm abundance reveal the equation of state.
Heavy quark observables enhance understanding of QCD fluid properties.
Abstract
After reviewing the evidence that QCD matter at ultrarelativistic energies behaves as a very good fluid, we describe the connection of QCD fluidity to heavy quark observables. We review the way in which heavy quark spectra can place tighter limits on the viscosity of QCD matter. Finally, we show that correlations between flow observables and the event-by-event charm quark abundance ("flavoring") can shed light on the system's equation of state.
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