Abstract
Recently it was shown that in QCD-like theories with , where is the number of light flavors and is the number of colors, there are correlation functions that vanish in perturbation theory and at short distances receive dominant, calculable contributions from small instantons. Here we extend the set of such objects to theories with , which includes real QCD, and discuss their application as a calibration of lattice computations at small quark mass. We revisit the related issue of the quark mass and its additive renormalization by small instantons, and discuss an alternative test of on the lattice.
- Received 30 May 2015
DOI:https://doi.org/10.1103/PhysRevD.92.054004
© 2015 American Physical Society