Universal Landau pole and physics below the 100 TeV scale

Abstract

We reconsider the possibility that all standard model gauge couplings blow up at a common scale in the ultraviolet. The simplest implementation of this idea assumes supersymmetry and the addition of a single vector-like generation of matter fields around the TeV scale. We provide an up-to-date numerical study of this scenario and show that either the scale of the additional matter or the scale of supersymmetry breaking falls below potentially relevant LHC bounds. We then consider minimal extensions of the extra matter sector that raise its scale above the reach of the LHC, to determine whether there are cases that might be probed at a 100 TeV collider. We also consider the possibility that the heavy matter sector involves new gauge groups constrained by the same ultraviolet boundary condition, which in some cases can provide an explanation for the multiplicity of heavy states. We comment on the relevance of this framework to theories with dark and visible sectors.

Mass scale of vectorlike matter and superpartners from IR fixed point predictions of gauge and top Yukawa couplings

“…[5], see also recent Ref. [6]. Similarly, if the additional particle content appears above the EW scale, the discrepancies between the values of gauge couplings predicted from closeness to the IR fixed point and corresponding observed values can be used to infer the mass scale of new physics, as was done for example in the SM extended by three complete VFs [7,8].…”