Abstract
We report on the first computation of the strong running coupling at the physical point (physical pion mass) from the ghost-gluon vertex, computed from lattice simulations with three flavors of domain wall fermions. We find α_{MS[over ¯]}(m_{Z}^{2})=0.1172(11), in remarkably good agreement with the world-wide average. Our computational bridge to this value is the Taylor-scheme strong coupling, which has been revealed of great interest by itself because it can be directly related to the quark-gluon interaction kernel in continuum approaches to the QCD bound-state problem.
Highlights
We report on the first computation of the strong running coupling at the physical point from the ghost-gluon vertex, computed from lattice simulations with three flavors of domain wall fermions
Our computational bridge to this value is the Taylor-scheme strong coupling, which has been revealed of great interest by itself because it can be directly related to the quark-gluon interaction kernel in continuum approaches to the QCD bound-state problem
Lattice QCD can be applied as a tool to convert a very precise physical observation used for the lattice spacing setting into ΛQCD
Summary
Strong Running Coupling from the Gauge Sector of Domain Wall Lattice QCD with Physical Quark Masses We report on the first computation of the strong running coupling at the physical point (physical pion mass) from the ghost-gluon vertex, computed from lattice simulations with three flavors of domain wall fermions.
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