In this paper we propose to interpret the large discretization artifacts affecting the neutral pion mass in maximally twisted lattice QCD simulations as O(a^2) effects whose magnitude is roughly proportional to the modulus square of the (continuum) matrix element of the pseudoscalar density operator between vacuum and one-pion state. The numerical size of this quantity is determined by the dynamical mechanism of spontaneous chiral symmetry breaking and turns out to be substantially larger than its natural magnitude set by the value of Lambda_QCD.

Dimopoulos, D., Frezzotti, R., Michael, M., Rossi, G., Urbach, C. (2010). O(a**2) cutoff effects in lattice Wilson fermion simulations. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81, 034509 [10.1103/PhysRevD.81.034509].

O(a**2) cutoff effects in lattice Wilson fermion simulations

FREZZOTTI, ROBERTO;ROSSI, GIANCARLO;
2010-01-01

Abstract

In this paper we propose to interpret the large discretization artifacts affecting the neutral pion mass in maximally twisted lattice QCD simulations as O(a^2) effects whose magnitude is roughly proportional to the modulus square of the (continuum) matrix element of the pseudoscalar density operator between vacuum and one-pion state. The numerical size of this quantity is determined by the dynamical mechanism of spontaneous chiral symmetry breaking and turns out to be substantially larger than its natural magnitude set by the value of Lambda_QCD.
2010
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/02 - FISICA TEORICA, MODELLI E METODI MATEMATICI
English
Con Impact Factor ISI
Lattice gauge theories; cutoff effects
Dimopoulos, D., Frezzotti, R., Michael, M., Rossi, G., Urbach, C. (2010). O(a**2) cutoff effects in lattice Wilson fermion simulations. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81, 034509 [10.1103/PhysRevD.81.034509].
Dimopoulos, D; Frezzotti, R; Michael, M; Rossi, G; Urbach, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/95169
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