- #1

mitchell porter

Gold Member

- 1,335

- 546

- TL;DR Summary
- Nonperturbative top-Higgs effects proposed to explain all violations of lepton universality

**Summary:**Nonperturbative top-Higgs effects proposed to explain all violations of lepton universality

Three years ago, Froggatt & Nielsen wanted to explain the, apparently spurious, 750 GeV resonance as top quarks bound, not just by the gluonic strong force, but also by the 'Higgs force', which for the top is also strong (top yukawa ~ 1).

Now they are back, aiming to explain most HEP deviations from the SM as due to nonperturbative top-Higgs effects:

https://arxiv.org/abs/1905.00070Colin D. Froggatt, Holger Bech Nielsen

(Submitted on 30 Apr 2019)

We interpret anomalies, deviations, from the standard model as being in fact due to effects not given by perturbation, because the top Yukawa coupling is after all so large that not by perturbation effects become important. Most of the anomalies found have the character of signaling violation of lepton universality. There are four lepton universality violating anomalies known at present, which we shall fit with one overall scale parameter to order of magnitude accuracy. One can look at the picture that we have found - due to the rather strong top Yukawa coupling - as a new sector of strongly interacting particles analogous to quantum color dynamics inside the standard model! [...]