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dc.contributor.authorLin, C. -J. Daviden_US
dc.contributor.authorOgawa, Kenjien_US
dc.contributor.authorRamos, Albertoen_US
dc.date.accessioned2019-04-03T06:43:36Z-
dc.date.available2019-04-03T06:43:36Z-
dc.date.issued2015-12-16en_US
dc.identifier.issn1029-8479en_US
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP12(2015)103en_US
dc.identifier.urihttp://hdl.handle.net/11536/146093-
dc.description.abstractWe perform the step-scaling investigation of the running coupling constant, using the gradient-flow scheme, in SU(3) gauge theory with twelve massless fermions in the fundamental representation. The Wilson plaquette gauge action and massless unimproved staggered fermions are used in the simulations. Our lattice data are prepared at high accuracy, such that the statistical error for the renormalised coupling, g(GF), is at the subpercentage level. To investigate the reliability of the continuum extrapolation, we employ two different lattice discretisations to obtain g(GF). For our simulation setting, the corresponding gauge-field averaging radius in the gradient flow has to be almost half of the lattice size, in order to have this extrapolation under control. We can determine the renormalisation group evolution of the coupling up to g(GF)(2) similar to 6, before the onset of the bulk phase structure. In this infrared regime, the running of the coupling is significantly slower than the two-loop perturbative prediction, although we cannot draw definite conclusion regarding possible infrared conformality of this theory. Furthermore, we comment on the issue regarding the continuum extrapolation near an infrared fixed point. In addition to adopting the fit ansatz a'la Symanzik for performing this task, we discuss a possible alternative procedure inspired by properties derived from low-energy scale invariance at strong coupling. Based on this procedure, we propose a finite-size scaling method for the renormalised coupling as a means to search for infrared fixed point. Using this method, it can be shown that the behaviour of the theory around g(GF)(2) similar to 6 is still not governed by possible infrared conformality.en_US
dc.language.isoen_USen_US
dc.subjectLattice Gauge Field Theoriesen_US
dc.subjectTechnicolor and Composite Modelsen_US
dc.subjectRenormalization Groupen_US
dc.titleThe Yang-Mills gradient flow and SU(3) gauge theory with 12 massless fundamental fermions in a colour-twisted boxen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/JHEP12(2015)103en_US
dc.identifier.journalJOURNAL OF HIGH ENERGY PHYSICSen_US
dc.citation.issue12en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department物理研究所zh_TW
dc.contributor.departmentInstitute of Physicsen_US
dc.identifier.wosnumberWOS:000411144800001en_US
dc.citation.woscount10en_US
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