Cross-correlators of conserved charges in QCD

We present cross-correlators of QCD conserved charges at ${\mu }_B=0$ from lattice simulations and perform a Hadron Resonance Gas (HRG) model analysis to break down the hadronic contributions to these correlators. We construct a suitable hadronic proxy for the ratio $-{\chi }_{11}^{BS}\mathrm{/}{\chi }_2^S$ and discuss the dependence on the chemical potential and experimental cuts. We then perform a comparison to preliminary STAR results and comment on a possible direct comparison of lattice and experiment.