Chiral perturbation theory for lattice QCD with a twisted mass term

Abstract

Quantum Chromodynamics on a lattice with Wilson fermions and a chirally twisted mass term for two degenerate quark flavours is considered in the framework of chiral perturbation theory. The pion mass and decay constant are calculated in next-to-leading order including terms linear in the lattice spacing $a$.

Comments: 5 pages, LaTeX2e, typos corrected, 2 references added