Two-loop BRST-restoring finite counter-terms for chiral non-abelian gauge theories

Abstract

We study the renormalization of anomaly-free chiral $SU(N)$ gauge theories without scalar fields through two-loop order. We adopt the Breitenlohner--Maison--'t Hooft--Veltman (BMHV) scheme for the treatment of ${\gamma }_5$ in dimensional regularization. This prescription induces spurious breaking of BRST symmetry, requiring finite symmetry-restoring counter-terms in addition to the subtraction of ultraviolet divergences. We derive these counter-terms for a general, possibly reducible fermion representation, thus restoring the BRST symmetry, through two loops.

arXiv comment55 pages,45 figures