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The phase structure of zero temperature twisted mass lattice QCD isinvestigated. We find strong metastabilities in the plaquette observable whenthe untwisted quark mass assumes positive or negative values. We provideinterpretations of this phenomenon in terms of chiral symmetry breaking and theeffective potential model of Sharpe and Singleton.Comment: 31 pages, 7 figures; published version with added clarification

Twisted mass quarks and the phase structure of lattice QCD