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On the prediction of spectral densities from Lattice QCD

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arxiv 2310.16243 v2 pith:UFZKDMKE submitted 2023-10-24 hep-lat

classification hep-lat
keywords spectraldensitieslatticeadoptedalgorithmanalysiscasedefined
verification ladder T0 review T1 audit T2 compute T3 formal
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Hadronic spectral densities play a pivotal role in particle physics, a prime 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.

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  1. Spectral densities from Euclidean-time lattice correlation functions

    hep-lat 2025-01 conditional novelty 5.0 of 10

    A Tikhonov-regularized inverse Laplace transform built on the Mellin basis extracts spectral densities from Euclidean correlators, with an exact discrete-lattice version and controlled smearing kernels.

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