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Twisted mass quarks and the phase structure of lattice QCD |
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| Authors: | F?Farchioni R?Frezzotti K?Jansen I?Montvay G?C?Rossi E?Scholz |
| Institution: | (1) Institut für Theoretische Physik, Universität Münster, Wilhelm-Klemm-Strasse 9, 48149 Münster, Germany;(2) INFN, Sezione di Milano and Dipartimento di Fisica, Universitá di Milano  Bicocca , Piazza della Scienza 3, 20126 Milano, Italy;(3) NIC/DESY Zeuthen, Platanenallee 6, 15738 Zeuthen, Germany;(4) Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany;(5) Dipartimento di Fisica, Universitá di Roma Tor Vergata and INFN, Sezione di Roma 2, Via della Ricerca Scientifica, 00133 Roma, Italy;(6) Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14196 Berlin, Germany |
| Abstract: | The phase structure of zero temperature twisted mass lattice QCD is investigated. We find strong metastabilities in the plaquette observable in correspondence of which the untwisted quark mass assumes positive or negative values. We provide interpretations of this phenomenon in terms of chiral symmetry breaking and the effective potential model of Sharpe and Singleton.Received: 24 August 2004, Revised: 29 October 2004, Published online: 25 January 2005 |
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