Flavorful Two Higgs Doublet Model with a Twin

TL;DR

This paper introduces a two Higgs doublet model combined with a twin Higgs mechanism, providing a novel approach to stabilize the Higgs mass while explaining flavor structure, and explores its collider signatures and constraints.

Contribution

It proposes a flavorful two Higgs doublet model integrated with twin Higgs, analyzing its phenomenology and experimental constraints.

Findings

Higgs signal strength and $B_s o \mu\mu$ decay are key constraints.

Heavy Higgs can produce displaced $b$-jet decays.

Model predicts distinctive collider signatures in certain parameter regions.

Abstract

A two Higgs doublet model with flavorful Yukawa structure, in which the two doublets give mass to the third and the first two generations respectively, is combined with the twin Higgs mechanism to stabilize the Higgs mass against radiative corrections. We consider both a mirror twin and fraternal twin setup. We identify Higgs signal strength measurements and the decay $B_s \to \mu\mu$ as the most important indirect constraints on the parameter space of the model. We explore the collider phenomenology of the model and find that the heavy Higgs in the visible sector can give a sizable number of displaced decays into $b$-jets in regions of parameter space where the SM-like Higgs and the twin Higgs do not provide any striking signatures.