Gribov copies, lattice QCD and the gluon propagator

Detalhes bibliográficos
Autor(a) principal: Silva, P. J.
Data de Publicação: 2004
Outros Autores: Oliveira, O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/4444
https://doi.org/10.1016/j.nuclphysb.2004.04.020
Resumo: We address the problem of Gribov copies in lattice QCD. The gluon propagator is computed, in the Landau gauge, using 302 ([beta]=5.8) 124 SU(3) configurations gauge fixed to different copies. The results of the simulation shows that: (i) the effect of Gribov copies is small (less than 10%); (ii) Gribov copies change essentially the lowest momenta components (q<2.6 GeV); (iii) within the statistical accuracy of our simulation, the effect of Gribov copies is resolved if statistical errors are multiplied by a factor of two or three. Moreover, when modelling the gluon propagator, different sets of Gribov copies produce different sets of parameters not, necessarily, compatible within one standard deviation. Finally, our data supports a gluon propagator which, for large momenta, behaves like a massive gluon propagator with a mass of 1.1 GeV.
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spelling Gribov copies, lattice QCD and the gluon propagatorLattice QCDLandau gaugeGauge fixingGribov copiesGluon propagatorGluon massWe address the problem of Gribov copies in lattice QCD. The gluon propagator is computed, in the Landau gauge, using 302 ([beta]=5.8) 124 SU(3) configurations gauge fixed to different copies. The results of the simulation shows that: (i) the effect of Gribov copies is small (less than 10%); (ii) Gribov copies change essentially the lowest momenta components (q<2.6 GeV); (iii) within the statistical accuracy of our simulation, the effect of Gribov copies is resolved if statistical errors are multiplied by a factor of two or three. Moreover, when modelling the gluon propagator, different sets of Gribov copies produce different sets of parameters not, necessarily, compatible within one standard deviation. Finally, our data supports a gluon propagator which, for large momenta, behaves like a massive gluon propagator with a mass of 1.1 GeV.http://www.sciencedirect.com/science/article/B6TVC-4CDJ80P-2/1/756ee6b978f0c2ae3dc804289ab89a322004info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/4444http://hdl.handle.net/10316/4444https://doi.org/10.1016/j.nuclphysb.2004.04.020engNuclear Physics B. 690:1-2 (2004) 177-198Silva, P. J.Oliveira, O.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:49:24Zoai:estudogeral.uc.pt:10316/4444Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:36.781802Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Gribov copies, lattice QCD and the gluon propagator
title Gribov copies, lattice QCD and the gluon propagator
spellingShingle Gribov copies, lattice QCD and the gluon propagator
Silva, P. J.
Lattice QCD
Landau gauge
Gauge fixing
Gribov copies
Gluon propagator
Gluon mass
title_short Gribov copies, lattice QCD and the gluon propagator
title_full Gribov copies, lattice QCD and the gluon propagator
title_fullStr Gribov copies, lattice QCD and the gluon propagator
title_full_unstemmed Gribov copies, lattice QCD and the gluon propagator
title_sort Gribov copies, lattice QCD and the gluon propagator
author Silva, P. J.
author_facet Silva, P. J.
Oliveira, O.
author_role author
author2 Oliveira, O.
author2_role author
dc.contributor.author.fl_str_mv Silva, P. J.
Oliveira, O.
dc.subject.por.fl_str_mv Lattice QCD
Landau gauge
Gauge fixing
Gribov copies
Gluon propagator
Gluon mass
topic Lattice QCD
Landau gauge
Gauge fixing
Gribov copies
Gluon propagator
Gluon mass
description We address the problem of Gribov copies in lattice QCD. The gluon propagator is computed, in the Landau gauge, using 302 ([beta]=5.8) 124 SU(3) configurations gauge fixed to different copies. The results of the simulation shows that: (i) the effect of Gribov copies is small (less than 10%); (ii) Gribov copies change essentially the lowest momenta components (q<2.6 GeV); (iii) within the statistical accuracy of our simulation, the effect of Gribov copies is resolved if statistical errors are multiplied by a factor of two or three. Moreover, when modelling the gluon propagator, different sets of Gribov copies produce different sets of parameters not, necessarily, compatible within one standard deviation. Finally, our data supports a gluon propagator which, for large momenta, behaves like a massive gluon propagator with a mass of 1.1 GeV.
publishDate 2004
dc.date.none.fl_str_mv 2004
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/4444
http://hdl.handle.net/10316/4444
https://doi.org/10.1016/j.nuclphysb.2004.04.020
url http://hdl.handle.net/10316/4444
https://doi.org/10.1016/j.nuclphysb.2004.04.020
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Nuclear Physics B. 690:1-2 (2004) 177-198
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