Speaker
Ms
Aditi Raval
(Indiana University Bloomington)
Description
The deviation of the measured value of the muon anomalous magnetic moment from the standard model prediction can be completely explained by mixing of the muon with extra vectorlike leptons, L and E, near the electroweak scale. This mixing simultaneously contributes to the muon mass. We show that the correlation between contributions to the muon mass and muon g-2 is controlled by the mass of the vectorlike doublet L. Positive correlation, simultaneously explaining both measured values, requires the mass of the doublet below 200 GeV. The decay rate of the Higgs boson to muon pairs is modified and ranges from 0 to $\sim 25$ times the standard model prediction. A part of the parameter space is already excluded by the LHC searches for $h \to \mu^+ \mu^-$. In the same scenario with keeping all the Yukawa couplings perturbative to the grand unification scale the $h \to \gamma \gamma$ can be enhanced by 25\% or lowered by $\sim 30\%$. The explanation of muon g-2 anomaly and $h \to \gamma \gamma$ is however not correlated since these are controlled by independent parameters. We discuss a possible UV embedding of this scenario with three complete vectrolike families featuring gauge coupling unification, sufficiently stable proton, and the Higgs quartic coupling remaining positive all the way to the grand unification scale. The predicted gauge couplings at the electroweak scale are understood from IR fixed point predictions and threshold effects from integrating out vectorlike families.
Author
Prof.
Radovan Dermisek
(Indiana University)
Co-author
Ms
Aditi Raval
(Indiana University Bloomington)
