Probing triple Higgs couplings of the Two Higgs Doublet Model at Linear Collider

Arhrib, Abdesslam; Benbrik, Rachid; Chiang, Cheng-Wei

Probing triple Higgs couplings of the Two Higgs Doublet Model at Linear Collider

Authors

Arhrib, Abdesslam

Benbrik, Rachid

Chiang, Cheng-Wei

Description

We study double Higgs production at the future Linear Collider in the framework of the Two Higgs Doublet Models through the following channels: $e^+e^- \to Φ_i Φ_j Z$, $Φ_i=h^0, H^0, A^0, H^\pm$. All these processes are sensitive to triple Higgs couplings. Hence observations of them provide information on the triple Higgs couplings that help reconstructing the scalar potential. We also discuss the double Higgs-strahlung $e^+e^- \to h^0 h^0 Z$ in the decoupling limit where $h^0$ mimics the SM Higgs boson. The processes $e^+e^- \to h^0 h^0 Z$ and $e^+e^- \to h^0 H^0 Z$ are also discussed in the fermiophobic limit where distinctive signatures such as $4γ+X$, $2γ+X$ and $6γ+X$ are expected in the Type-I Two Higgs Doublet Model.
21 pages and 9 figures; one figure and some discussions added, version to appear in PRD