Confining force and running coupling with twelve fundamental and two sextet fermions

Understand

We investigate two models of much recent interest in lattice Beyond Standard Model studies: N_f=2 fermions in the 2-index symmetric (sextet) representation, and N_f=12 fermions in the fundamental representation, both with SU(3) gauge symmetry.

• We present results at fixed lattice spacing for the static fermion potential and force as measured via lattice simulations.
• We show indications that both models are confining in the chiral limit and that neither theory is conformal.
• This is consistent with our findings for the mass spectrum, which indicate that chiral symmetry is spontaneously broken in both theories.