Chiral perturbation theory for twisted mass QCD

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 masses and decay constants are calculated in next-to-leading order including terms linear in the lattice spacing a. We treat both unquenched and partially quenched QCD. We also discuss the phase structure of twisted mass lattice QCD.

Comments: Talk presented at Lattice2004(spectrum), Fermilab, June 21-26, 2004, 3 pages, 1 Postscript figure, LaTeX2e, uses espcrc2.sty, editorial corrections