Non-perturbative tests of HQET in small-volume quenched QCD

TL;DR

This paper tests the predictions of Heavy Quark Effective Theory (HQET) by comparing lattice QCD calculations of current matrix elements and energies across various quark masses in a small-volume quenched setup, confirming HQET's validity at large quark masses.

Contribution

It provides a non-perturbative verification of HQET predictions in small-volume quenched lattice QCD, demonstrating the effective theory's accuracy at large quark masses.

Findings

HQET accurately describes large quark mass behavior

Quantitative agreement between lattice data and HQET predictions

Validation of HQET in a non-perturbative small-volume setting

Abstract

We quantitatively investigate the quark mass dependence of current matrix elements and energies, calculated over a wide range of quark masses in the continuum limit of small-volume quenched lattice QCD. By a precise comparison of these observables as functions of the heavy quark mass with the predictions of HQET we are able to verify that their large quark mass behaviour is described by the effective theory.