Mass anomalous dimension in sextet QCD

Abstract

We extend our previous study of the SU(3) gauge theory with N_f=2 flavors of fermions in the sextet representation of color. Our tool is the Schroedinger functional method. By changing the lattice action, we push the bulk transition of the lattice theory to stronger couplings and thus reveal the beta function and the mass anomalous dimension gamma_m over a wider range of coupling, out to g^2 ~ 11. Our results are consistent with an infrared fixed point, but walking is not ruled out. Our main result is that gamma_m never exceeds 0.45, making the model unsuitable for walking technicolor. We use a novel method of extrapolation to the large-volume/continuum limit, tailored to near-conformal theories.

16 pages, 12 figures. Some clarifications from v2. Final version

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Cited by in corpus (31)

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• Can the nearly conformal sextet gauge model hide the Higgs impostor?
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• Strong dynamics, composite Higgs and the conformal window
• The Technicolor Higgs in the Light of LHC Data
• Conformal Behavior at Four Loops and Scheme (In)Dependence
• SU(4) lattice gauge theory with decuplet fermions: Schrödinger functional analysis
• Near the sill of the conformal window: gauge theories with fermions in two-index representations
• A lattice QCD study of generalized gluelumps
• Non-perturbative beta function in three-dimensional electrodynamics
• The renormalization group step scaling function of the 2-flavor SU(3) sextet model
• Physics of the Non-Abelian Coulomb Phase: Insights from Padé Approximants
• Global Structure of Conformal Theories in the SU(3) Gauge Theory
• Higher-Order Scheme-Independent Calculations of Physical Quantities in the Conformal Phase of a Gauge Theory
• Anomalous dimensions on the lattice
• A linear sigma model for multiflavor gauge theories
• The SU(3) Sextet Model with Wilson Fermions
• Sextet Model with Wilson Fermions
• Twelve fundamental and two sextet fermion flavors
• The sextet gauge model, light Higgs, and the dilaton
• Lattice Gauge Theories at the Energy Frontier
• Topology of Minimal Walking Technicolor
• The chiral phase transition for lattice QCD with 2 colour-sextet quarks
• Thermodynamics of lattice QCD with 3 flavours of colour-sextet quarks II: N_t=6 and N_t=8
• Anomalous Dimensions at an Infrared Fixed Point in an SU($N_c$) Gauge Theory with Fermions in the Fundamental and Antisymmetric Tensor Representations
• Gauge theories with fermions in two-index representations
• QCD with colour-sextet quarks
• Conformal or confining -- results from lattice gauge theory for higher-representation gauge theories
• Further studies of QCD with sextet quarks
• Models of Walking Technicolor on the Lattice
• Mapping the Conformal Window: SU(2) with 4, 6 and 10 flavors of fermions