2 Higgs or not 2 Higgs

TL;DR

This paper investigates how two Higgs doublet models with approximate PQ symmetry can modify Higgs decay patterns without affecting production, especially near the decoupling limit, with implications for supersymmetric models.

Contribution

It provides a detailed analysis of Higgs couplings in two Higgs doublet models with approximate PQ symmetry, including effective couplings near the decoupling limit and constraints in supersymmetric scenarios.

Findings

Higgs decay patterns can be significantly modified while production remains unchanged.

Effective Higgs couplings are derived with all orders in (m_h/m_H) for small PQ breaking.

Supersymmetric models impose strong constraints on these Higgs coupling modifications.

Abstract

Motivated by recent results from the LHC experiments, we analyze Higgs couplings in two Higgs doublet models with an approximate PQ symmetry. Models of this kind can naturally accommodate sizable modifications to Higgs decay patterns while leaving production at hadron colliders untouched. Near the decoupling limit, we integrate out the heavy doublet to obtain the effective couplings of the SM-like Higgs and express these couplings in a physically transparent way, keeping all orders in (m_h/m_H) for small PQ breaking. Considering supersymmetric models, we show that the effects on the Higgs couplings are considerably constrained.