Bayesian Analysis and Analytic Continuation of Scattering Amplitudes from Lattice QCD

by Dr Miguel Salg

Tuesday 7 Oct 2025, 16:00 → 18:00 Europe/Zurich

4/2-037 - TH meeting room (CERN)

We present a novel procedure for analyzing the lattice-QCD spectrum via the finite-volume formalism to obtain constraints on multi-hadron scattering amplitudes at both real and complex energies. This approach combines a Bayesian reconstruction of the scattering amplitude on the real axis with Nevanlinna interpolation for analytic continuation to complex-valued energies. The method is non-parametric, inherently accounting for parametrization dependence within the uncertainty. We demonstrate the applicability of this approach using real lattice-QCD data in resonant systems from the HadSpec and BaSc collaborations.