Anomalies/deviations from Standard Model interpreted as non-pertubative effects

Holger Bech Nielsen, Niels Bohr Institute Copenhagen

Weekly Theory Seminar.


Even though the Standard Model works phantastically well, there are some very few, about 5, small possible deviations, so called anomalies. Four of them have the character of violating lepton universality in the sense that comparing two reactions only deviating from each other by one lepton flavour say an electron has been replaced by another lepton flavour say muon. In the talk I present the work by Colin Froggatt and myself in which we interpret these anomalies as being due to non-pertubative effects caused by the top-yukawa-coupling being so large that we can expect that there should appear non-perturbative effects, such as e.g. bound states or a new phase of vacuum or whatever like that.

The model works surprisingly well although we should probably only expect to give the order of magnitude right even if it were true. It has however a problem when applied to neutral meson mixing, where it tends to give too large anomaly predictions. 

(The slides will be available here)

Published May 13, 2019 8:16 AM - Last modified May 13, 2019 8:16 AM