Spontaneous CP-violation in the Simplest Little Higgs Model

TL;DR

This paper explores how spontaneous CP-violation can occur in the simplest little Higgs model, updating the formalism and phenomenology, and analyzing constraints from collider and EDM measurements.

Contribution

It introduces a new mechanism for spontaneous CP-violation in the simplest little Higgs model and updates the phenomenological analysis with current experimental constraints.

Findings

LHC Z' searches constrain the scale to f > 8 TeV

Higgs measurements limit scalar mixing angles

EDM constraints are relatively weak for this model

Abstract

We proposed how spontaneous CP-violation can be generated in the simplest little Higgs model in this talk. Comparing with the original paper, both formalism and phenomenology are updated. The model is still alive facing the collider and electric dipole moment (EDM) measurements. Strictest constraint comes from LHC $Z'$ direct search, which leads to $f\gtrsim8~\textrm{TeV}$. Higgs measurements also set strict constraint on the scalar mixing angle, if the Higgs rare decay channel is open. EDM measurements still set weak constraints for this model, even after the recent ACME updated measurement on electron's EDM. In this talk, we also discussed the test of CP-violation in the scalar sector, through the interactions between scalars and gauge bosons.