2023/01/24 by Leonardo Chimirri, Chimirri, Leonardo
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2301.09959
openalex publication_date 2023/01/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03
The parametric error on the QCD-coupling can be a dominant source of uncertainty in several important observables. One way to extract the coupling is to compare high order perturbative computations with lattice evaluated moments of heavy quark two-point functions. The truncation of the perturbative series is a sizable systematic uncertainty that needs to be under control. In this contribution we give an update on our study arXiv:hep-lat/2203.07936v1 on this issue. We measure pseudo-scalar two-point functions in volumes of L=2 fm with twisted-mass Wilson fermions in the quenched approximation. We use full twist, the non-perturbative clover term and lattice spacings down to a=0.010 fm to tame the large discretization effects. Our results show that both the continuum extrapolations and the extrapolation of the Λ-parameter to the asymptotic perturbative region are very challenging.