Conveners
Parallel Session II.2
- Michael Ratz
Experimental hints for lepton flavor universality violation in beauty-quark decay both in neutral- and charged-current transitions require an extension of the Standard Model for which scalar leptoquarks (LQs) are the prime candidates. Besides, these same LQs can resolve the long-standing tension in the muon and the recently reported deviation in the electron $g-2$ anomalies. These tantalizing...
We consider a model where a global U(1) symmetry is simultaneously responsible for solving the Strong CP problem à la Peccei-Quinn and for explaining the lepton mass hierarchies à la Froggatt-Nielsen. The axion resulting from the symmetry breaking can have sizeable flavor violating couplings, which propagate to the SM 126 GeV Higgs through scalar mixing. We investigate the bounds from Higgs...
We explore a simple but extremely predictive extension of the scotogenic model. We promote the scotogenic symmetry $\mathbb{Z}_2$ to the flavour non-Abelian symmetry $\Sigma(81)$, which can also automatically protect dark matter stability. In addition, $\Sigma(81)$ leads to striking predictions in the lepton sector: only Inverted Ordering is realised, the absolute neutrino mass scale is...
Despite exceptional appeal of the Peccei-Quinn mechanism, alternative solutions
to the strong CP problem should be pursued. In this direction and given the tight
connection of the strong CP problem with flavor, we explore how a Nelson-
Barr mechanism (NB) arises automatically in the context of gauged flavor models and solves some of the issues of usual NB realizations.
