Hadronic spectral densities play a pivotal role in particle physics, a primer example being the R-ratio defined from electron-positron scattering into hadrons. To predict them from first principles using Lattice QCD, we face a numerically ill-posed inverse problem, due to the Euclidean signature adopted in practical simulations. Here we present a recent numerical analysis of the vector isovector spectral density extracted using the multi-level algorithm (recently extended also to the case of dynamical fermions) and discuss its implications.

Bruno, M., Giusti, L., Saccardi, M. (2024). On the prediction of spectral densities from Lattice QCD. Intervento presentato a: The 20th International Conference on Hadron Spectroscopy and Structure (HADRON 2023) 05–09 giu 2023, Genova, Italy [10.1393/ncc/i2024-24197-5].

On the prediction of spectral densities from Lattice QCD

Bruno, M
Co-primo
;
Giusti, L
Co-primo
;
Saccardi, M
Co-primo
2024

Abstract

Hadronic spectral densities play a pivotal role in particle physics, a primer example being the R-ratio defined from electron-positron scattering into hadrons. To predict them from first principles using Lattice QCD, we face a numerically ill-posed inverse problem, due to the Euclidean signature adopted in practical simulations. Here we present a recent numerical analysis of the vector isovector spectral density extracted using the multi-level algorithm (recently extended also to the case of dynamical fermions) and discuss its implications.
slide + paper
Lattice QCD; inverse problem; multi-level; spectral density
English
The 20th International Conference on Hadron Spectroscopy and Structure (HADRON 2023) 05–09 giu 2023
2023
2024
47
4
197
https://agenda.infn.it/event/33110/contributions/198090/
open
Bruno, M., Giusti, L., Saccardi, M. (2024). On the prediction of spectral densities from Lattice QCD. Intervento presentato a: The 20th International Conference on Hadron Spectroscopy and Structure (HADRON 2023) 05–09 giu 2023, Genova, Italy [10.1393/ncc/i2024-24197-5].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/468165
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