Triple Higgs boson production in a -collider at the future linear collider

Nasuf SÖNMEZ

doi:10.3906/fiz-1807-6

Abstract

In this study, triple Higgs boson production channels in a γγ-collider are investigated in the context of the two-Higgs-doublet model (2HDM). This model has three neutral Higgs bosons (h0/H0/A0 ) and two charged Higgs bosons (H±). Between all the possible combinations of the triple Higgs bosons in the final state, only the following two scattering processes are probable at tree-level: γγ → H+H-h0 and γγ → H+H-H0. These two processes are important to determine the triple Higgs self-couplings gH+H-h0 and gH+H-H0 in the 2HDM. The calculation is carried out for two scenarios, which are inspired by recent experimental and theoretical results. The cross-section of these processes is calculated and a comparison is made for these scenarios. The total convoluted cross-section with photon luminosity in an e+e- -collider is presented as a function of the center of mass energy.

Highlights

The discovery of the Higgs boson at CERN [1,2,3] is an undeniable solid experimental proof of the electroweak symmetry breaking mechanism that makes it possible to give mass to the Goldstone bosons
The efforts put into the ILC [4] and the CLIC [5] projects were combined towards the collider, which is called the Linear Collider Collaboration (LCC) [6]
The calculation is performed in the 2HDM, and the free parameters of the model are inspired by a recent study

Summary

Introduction

The discovery of the Higgs boson at CERN [1,2,3] is an undeniable solid experimental proof of the electroweak symmetry breaking mechanism that makes it possible to give mass to the Goldstone bosons. There are various possible triple Higgs final states in the 2HDM, but in a γγ -collider only the following final states are accessible at tree-level while the CP is conserved: H+H−h0 and H+H−H0. These two processes and the Higgs sector regarding the γγ -collider will be investigated here. The triple Higgs boson production in the 2HDM is studied, and the two processes γγ → H+H−h0 and γγ → H+H−H0 are investigated.

The scalar sector of the 2HDM

Theoretical constraints

Region for the analysis

Numerical analysis and discussion

Findings

Conclusion