https://doi.org/10.1140/epjc/s2004-02078-9
theoretical physics
Twisted mass quarks and the phase structure of lattice QCD
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
* e-mail: andrea.shindler@desy.de
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.
© Springer-Verlag, 2005
