On the decoupling of mirror fermions

Abstract

We study an approach to chiral gauge theories on the lattice that involves decoupling "mirror" fermions from a vector-like theory. We have computed the polarization tensor in the "3-4-5" theory and find a directional discontinuity that appears to be nonzero in the continuum limit. This strongly suggests that the mirror fermions do not decouple.

Comments: 7 pages, 2 figures, Lattice 2013 proceedings (Mainz, Germany)