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In this work the shear viscosity $\eta$ and the diffusion coefficients ofconserved charges $\kappa_{ij}$ with $i,j\in\{B,Q,S\}$ of hadronic matter areinvestigated within the hadronic transport approach SMASH. We systematicallystudy the effect of multi-particle reactions, angular distributions andadditional elastic cross sections via the additive quark model description, thenumbers of degrees of freedom and the baryon density on the transportcoefficients using the Green-Kubo formalism. We find that multi-particlereactions decrease the shear viscosity in a simplified hadron gas whereas theelectric charge diffusion coefficient is not modified. Furthermore, additionalelastic cross sections have a strong impact on both $\eta$ and $\kappa_{ij}$whereas anisotropic scatterings enhance the shear viscosity in the full hadrongas. When increasing the number of degrees of freedom the shear viscosity isonly slightly modified in comparison to the diffusion coefficients. Finally,the calculation within a finite baryon chemical potential reveals that theshear viscosity itself does not depend on $\mu_B$ but on the ratio $\eta / s$.The diffusion coefficients show a strong dependency which we compare toChapman-Enskog calculations.

Collision term dependence of the hadronic shear viscosity and diffusion coefficients