Spectral reconstruction of Euclidean correlator moments in lattice QCD

2023/11/10 by Bulava, John · 1 citation
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.2311.06027

Abstract

A novel application of lattice QCD spectral reconstruction is presented, in which euclidean correlation function data in a fixed time range are used to infer values outside the range, enabling a model-independent investigation of the asymptotic large-time behavior. Moments of the correlator are also determined, and reconstructed correlation matrices between different moments are included in a variational optimization similar to the standard Generalized Eigenvalue Problem (GEVP). These ideas are illustrated using a single-nucleon correlation function determined on an N_\rm=2+1 ensemble of gauge configurations at m_π = 200\rm MeV.

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