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Reducing cutoff effects in maximally twisted LQCD close to the chiral limit

Roberto Frezzotti
•
Martinelli, Guido
•
Mauro Lucio Papinutto
•
Giancarlo Rossi
2006
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
When analyzed in terms of the Symanzik expansion, lattice correlators of multi-local (gauge-invariant) operators with non-trivial continuum limit exhibit in maximally twisted lattice QCD ''infrared divergent'' cutoff effects of the type a 2k/(m π 2) h, 2k h 1 (k,h integers), which tend to become numerically large when the pion mass gets small. We prove that, if the action is O(a) improved la Symanzik or, alternatively, the critical mass counter-term is chosen in some ''optimal'' way, these lattice artifacts are reduced to terms that are at worst of the order a 2(a 2/m π 2) k-1, k 1. This implies that the continuum extrapolation of lattice results is smooth at least down to values of the quark mass, m q, satisfying the order of magnitude inequality m q>a 2Λ 3 QCD. © SISSA 2006.
DOI
10.1088/1126-6708/2006/04/038
WOS
WOS:000237369000021
Archivio
http://hdl.handle.net/20.500.11767/32919
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33646414181
Diritti
metadata only access
Soggetti
  • lattice qcd

  • nonperturbative effec...

Scopus© citazioni
57
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
64
Data di acquisizione
Feb 27, 2024
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