出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Information of the phase structure of many avor SU(3) gauge theory is of great interest for nding a theory which dynamically breaks the electro-weak symmetry. We study the SU(3) gauge theory with fermions for Nf = 12 and 16 in fundamental representation. Both of them, through perturbation theory, reside in the conformal phase. We try to determine the phase of each theory non-perturbatively with lattice simulation and to nd the characteristic behavior of the physical quantities in the phase. HISQ type staggered fermions are used to reduce the discretization error which could compromise the behavior of the physical quantity to determine the phase structure at non-zero lattice spacings. Spectral quantities such as bound state masses of meson channel and meson decay constants are investigated with careful nite volume analysis. Our data favor the conformal over chiral symmetry breaking scenario for both Nf = 12 and 16.
