We summarize four contributions about dynamical twisted mass fermions. The resulting report covers results for N f = 2 obtained from three different gauge actions, namely the standard Wilson plaquette gauge action [1], the DBW2 [2] and the tree-level Symanzik improved [3] gauge action. In addition, first results for N f = 2 + 1 + 1 flavours of twisted mass fermions are discussed.
Discretisation errors in two-flavour lattice QCD with Wilson-quarks and DBW2 gauge action are investigated by comparing numerical simulation data at two values of the bare gauge coupling. Both non-zero and zero twisted mass values are considered. The results, including also data from simulations using the Wilson plaquette gauge action, are compared to next-to-leading order chiral perturbation theory formulas.
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