2023/01/05 by Nazario Tantalo, Tantalo, Nazario · 1 citation
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.2301.02097
openalex publication_date 2023/01/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The first step of any QFT calculation, aiming at phenomenological predictions, is the matching of the theory to Nature. The matching procedure fixes the parameters of the theory in terms of an equal number of external inputs that, if the theory is expected to reproduce observations, must be experimentally measured physical quantities. At the sub-percent level of accuracy QED radiative corrections become important and the theory expected to describe the hadronic Universe is QCD+QED. Phenomenological predictions deriving from lattice QCD calculations do depend, at this level of precision, upon the choice of the external inputs used to match/define the approximate theory. In this written version of my talk I concentrate on the theoretical aspects of the matching procedure of lattice QCD+QED and of the definition of QCD, strongly advocating a community agreement on the matching scheme to be used in future lattice QCD calculations.