From Lattice Strong Dynamics to Phenomenology

Abstract

We present updated results on the chiral properties of SU(3) gauge theories with 2 and 6 massless Dirac fermions in the fundamental representation. Our focus is on the ratio $⟨\bar{\psi }\psi ⟩/F^3$, where $⟨\bar{\psi }\psi ⟩$ is the chiral condensate and $F$ is the pseudo-Nambu-Goldstone-boson decay constant. This ratio is of interest in the context of fermion mass generation within composite Higgs theories. By re-expanding certain ratios using next-to-leading-order chiral perturbation theory, we confirm our previous result of significant enhancement of this ratio at $N_f=6$ over $N_f=2$.

Comments: 7 pages, 2 figures. Proceedings of the SCGT '12 workshop, "Strong Coupling Gauge Theories in the LHC Perspective."