In this paper we discuss how the peculiar properties of twisted mass lattice QCD at maximal twist can be employed to set up a consistent computational scheme in which, despite the explicit breaking of chiral symmetry induced by the presence of the Wilson and mass terms in the action, it is possible to completely bypass the problem of wrong chirality and parity mixings in the computation of the CP-conserving matrix elements of the ΔS = 1, 2 effective weak hamiltonian, and at the same time have a positive determinant for pairs of non-degenerate quarks, as well as absence of O(a) discretization effects in on-shell quantities with no need of improving lattice action and operators. © SISSA/ISAS 2004.

Frezzotti, R., & Rossi, G. (2004). Chirally improving Wilson fermions 2. Four-quark operators. JOURNAL OF HIGH ENERGY PHYSICS, 8(10), 2369-2412 [doi:10.1088/1126-6708/2004/10/070].

Chirally improving Wilson fermions 2. Four-quark operators

FREZZOTTI, ROBERTO;ROSSI, GIANCARLO
2004

Abstract

In this paper we discuss how the peculiar properties of twisted mass lattice QCD at maximal twist can be employed to set up a consistent computational scheme in which, despite the explicit breaking of chiral symmetry induced by the presence of the Wilson and mass terms in the action, it is possible to completely bypass the problem of wrong chirality and parity mixings in the computation of the CP-conserving matrix elements of the ΔS = 1, 2 effective weak hamiltonian, and at the same time have a positive determinant for pairs of non-degenerate quarks, as well as absence of O(a) discretization effects in on-shell quantities with no need of improving lattice action and operators. © SISSA/ISAS 2004.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
English
Lattice Gauge Field Theories; Lattice QCD; Weak Decays
hep-lat/0407002
Frezzotti, R., & Rossi, G. (2004). Chirally improving Wilson fermions 2. Four-quark operators. JOURNAL OF HIGH ENERGY PHYSICS, 8(10), 2369-2412 [doi:10.1088/1126-6708/2004/10/070].
Frezzotti, R; Rossi, G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/24993
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