Chiral perturbation theory for partially quenched twisted mass lattice   QCD
  Partially quenched Quantum Chromodynamics with Wilson fermions on a lattice is considered in the framework of chiral perturbation theory. Two degenerate quark flavours are associated with a chirally twisted mass term. The pion masses and decay constants are calculated in next-to-leading order including terms linear in the lattice spacing $a$. 
Gernot M\"unster, Christian Schmidt (University of Muenster), Enno E.   Scholz (DESY Hamburg)