Theory Seminar - Miguel Salg

On Monday, Sept. 29, at 1 p.m., Miguel Salg of Bern University will present "Bayesian Analysis and Analytic Continuation of Scattering Amplitudes from Lattice QCD" via Zoom. The seminar will be livestreamed in CEBAF Center rm. L102.

Abstract: 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 Hadron Spectrum (HadSpec) and Baryon Scattering (BaSc) collaborations.