The maximally twisted lattice QCD action of an SUf(2) doublet of mass degenerate Wilson quarks gives raise to a real positive fermion determinant and it is invariant under the product of standard parity times the change of sign of the coefficient of the Wilson term. The existence of this spurionic symmetry implies that O(a) improvement is either automatic or achieved through simple linear combinations of quantities taken with opposite external three-momenta. We show that in the case of maximal twist all these nice results can be extended to the more interesting case of a mass non-degenerate quark pair.

Frezzotti, R., & Rossi, G. (2004). Twisted-mass lattice QCD with mass non-degenerate quarks. In Nuclear Physics B - Proceedings Supplements (pp.193-202) [10.1016/S0920-5632(03)02477-0].

Twisted-mass lattice QCD with mass non-degenerate quarks

FREZZOTTI, ROBERTO;
2004

Abstract

The maximally twisted lattice QCD action of an SUf(2) doublet of mass degenerate Wilson quarks gives raise to a real positive fermion determinant and it is invariant under the product of standard parity times the change of sign of the coefficient of the Wilson term. The existence of this spurionic symmetry implies that O(a) improvement is either automatic or achieved through simple linear combinations of quantities taken with opposite external three-momenta. We show that in the case of maximal twist all these nice results can be extended to the more interesting case of a mass non-degenerate quark pair.
2nd Cairns Topical Workshop on Lattice Hadron Physics
Cairns, AUSTRALIA
JUL 22-30, 2003
Rilevanza internazionale
su invito
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
English
WILSON FERMIONS; ZERO MODES
hep-lat/0311008
Intervento a convegno
Frezzotti, R., & Rossi, G. (2004). Twisted-mass lattice QCD with mass non-degenerate quarks. In Nuclear Physics B - Proceedings Supplements (pp.193-202) [10.1016/S0920-5632(03)02477-0].
Frezzotti, R; Rossi, G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/24991
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