# Instanton dominance over $\alpha_s$ at low momenta from lattice QCD simulations at $N_f=0$, $N_f=2+1$ and $N_f=2+1+1$

13 Feb 2018 Athenodorou Andreas Boucaud Philippe de Soto Feliciano Rodríguez-Quintero José Zafeiropoulos Savvas

We report on an instanton-based analysis of the gluon Green functions in the Landau gauge for low momenta; in particular we use lattice results for $\alpha_s$ in the symmetric momentum subtraction scheme (${\rm MOM}$) for large-volume lattice simulations. We have exploited quenched gauge field configurations, $N_f=0$, with both Wilson and tree-level Symanzik improved actions, and unquenched ones with $N_f=2+1$ and $N_f=2+1+1$ dynamical flavors (domain wall and twisted-mass fermions, respectively)... (read more)

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• HIGH ENERGY PHYSICS - LATTICE
• HIGH ENERGY PHYSICS - PHENOMENOLOGY