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Like fluctuations, non-diagonal correlators of conserved charges provide atool for the study of chemical freeze-out in heavy ion collisions. They can becalculated in thermal equilibrium using lattice simulations, and be connectedto moments of event-by-event net-particle multiplicity distributions. Wecalculate them from continuum extrapolated lattice simulations at $\mu_B=0$,and present a finite-$\mu_B$ extrapolation, comparing two different methods. Inorder to relate the grand canonical observables to the experimentally availablenet-particle fluctuations and correlations, we perform a Hadron Resonance Gas(HRG) model analysis, which allows us to completely break down thecontributions from different hadrons. We then construct suitable hadronicproxies for fluctuations ratios, and study their behavior at finite chemicalpotentials. We also study the effect of introducing acceptance cuts, and arguethat the small dependence of certain ratios on the latter allows for a directcomparison with lattice QCD results, provided that the same cuts are applied toall hadronic species. Finally, we perform a comparison for the constructedquantities for experimentally available measurements from the STARCollaboration. Thus, we estimate the chemical freeze-out temperature to 165 MeVusing a strangeness-related proxy. This is a rather high temperature for theuse of the Hadron Resonance Gas, thus, further lattice studies are necessary toprovide first principle results at intermediate $\mu_B$.

Off-diagonal correlators of conserved charges from lattice QCD and how to relate them to experiment