Sep 6 – 8, 2018
Max Planck Institute for Astrophysics (MPA)
Europe/Berlin timezone

Temperature- and momentum dependence of the heavy quark diffusion coefficient

Sep 7, 2018, 2:00 PM
E.0.11 (Max Planck Institute for Astrophysics (MPA))


Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching
Open Heavy Flavour Open Heavy Flavour


Prof. Steffen Bass (Duke University)


Recent years have seen significant theoretical progress in the transport description of open heavy quarks in QCD matter - a number of models are now able to simultaneously describe a subset of the most important heavy flavor observables - a simultaneous description of a comprehensive set of observables at all available collision energies still poses a challenge. A global analysis encompassing all available collision systems and energies as well as an improved treatment of known uncertainties for different observables would significantly improve our ability to distinguish between different theoretical models and constrain the heavy quark diffusion coefficient in an unbiased way.

In this study, we utilize two hybrid heavy quark transport models, a radiation improved Langevin approach and a hybrid linearized Boltzmann model with diffusive non-perturbative contributions, to extract the temperature- and momentum-dependence of the heavy quark transport coefficient via a Bayesian model-to-data analysis. In both cases the QGP medium is given by a state of the art viscous hydrodynamic evolution, which has been calibrated to soft flow observables in the light hadron sector.

The constrained diffusion coefficient is validated by comparing $B$-meson measurements along with $D$-meson $R_{\mathrm{AA}}$ in pPb collisions. New observables are proposed to further constrain the diffusion coefficient.

Primary author

Prof. Steffen Bass (Duke University)

Presentation materials