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We present a new determination of $\hat{q}$, the jet transport coefficient ofthe quark-gluon plasma. Using the JETSCAPE framework, we use Bayesian parameterestimation to constrain the dependence of $\hat{q}$ on the jet energy,virtuality, and medium temperature from experimental measurements of inclusivehadron suppression in Au-Au collisions at RHIC and Pb-Pb collisions at the LHC.These results are based on a multi-stage theoretical approach to in-medium jetevolution with the MATTER and LBT jet quenching models. The functionaldependence of $\hat{q}$ on jet energy, virtuality, and medium temperature isbased on a perturbative picture of in-medium scattering, with componentsreflecting the different regimes of applicability of MATTER and LBT. Thecorrelation of experimental systematic uncertainties is accounted for in theparameter extraction. These results provide state-of-the-art constraints on$\hat{q}$ and lay the groundwork to extract additional properties of thequark-gluon plasma from jet measurements in heavy-ion collisions.

Determining the jet transport coefficient $\hat{q}$ of the quark-gluon plasma using Bayesian parameter estimation