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• W2021569484 abstract "We critically examine a version of the top mode standard model recently cast in extra dimensions by Arkani-Hamed, Cheng, Dobrescu, and Hall, based on the (improved) ladder Schwinger-Dyson (SD) equation for the D-(=6,8-)-dimensional gauge theories. We find that the bulk QCD cannot have larger coupling beyond the non-trivial ultraviolet (UV) fixed point, the existence of which is supported by a recent lattice analysis. The coupling strength at the fixed point is evaluated by using the one-loop renormalization group equation. It is then found that, in a version with only the third family (as well as the gauge bosons) living in the D-dimensional bulk, the critical (dimensionless) coupling for dynamical chiral symmetry breaking to occur is larger than the UV fixed point of the bulk QCD coupling for D=6, while smaller for D=8. We further find that the improved ladder SD equation in D dimensions has an approximate scale-invariance due to the running of the coupling and hence has an essential-singularity scaling of the ``conformal phase transition,'' similar to Miransky scaling in the four-dimensional ladder SD equation with a nonrunning coupling. This essential-singularity scaling can resolve the fine-tuning even when the cutoff (``string scale'') is large. Such a theory has a large anomalous dimension gamma_m=D/2 - 1 and is expected to be free from the flavor-changing-neutral-current problem as in walking technicolor for D=4. Furthermore, the induced bulk Yukawa coupling becomes finite even at infinite cutoff limit (in the formal sense), similarly to the renormalizability of the gauged Nambu-Jona-Lasinio model. Comments are made on the use of the ``effective'' coupling, which includes finite renormalization effects, instead of the bar{MS} running coupling in the improved ladder SD equation." @default.
• W2021569484 created "2016-06-24" @default.
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• W2021569484 date "2001-07-16" @default.
• W2021569484 modified "2023-09-26" @default.
• W2021569484 title "Top mode standard model with extra dimensions" @default.
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• W2021569484 doi "https://doi.org/10.1103/physrevd.64.056003" @default.
• W2021569484 hasPublicationYear "2001" @default.
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