Hadronic spectral densities from lattice correlators

by Nazario Tantalo (Università di Roma, Tor Vergata)

Monday 20 Nov 2023, 14:30 → 16:30 Europe/Zurich

Room 5017 (Building U2 - Quantum)

Hadronic spectral densities are the key objects needed to unlock the huge amount of experimental information collected so far on QCD processes involving more than a single hadron in external states. In principle, hadronic spectral densities can be calculated with the required non-perturbative accuracy by performing lattice simulations. In practice, the extraction of spectral densities from euclidean correlators, the primary data of lattice simulations, is an extremely delicate numerical problem. In this talk I will discuss two approaches that allow to cope with this problem and present the results that we have recently obtained on the R-ratio (smeared in gaussian energy bins) and on inclusive hadronic decays of the tau lepton.