Topical seminar: Bayesian reconstruction and analytic continuation of scattering amplitudes from lattice QCD

por Fernando Romero López (IFIC)

jueves 12 feb. 2026 12:00 → 14:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

In this talk, I discuss 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 numerical analytic continuation to complex-valued energies using Nevanlinna-Pick
interpolation. 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 on two-nucleon scattering and the sigma resonance.