Abstract
An important task at future colliders is the investigation of the Higgs-boson sector. Here the measurement of the triple Higgs coupling(s) plays a special role. Based on previous analyses, within the framework of Two Higgs Doublet Models (2HDM) type I and II, we define and analyze several two-dimensional benchmark planes, that are over large parts in agreement with all theoretical and experimental constraints. For these planes we evaluate di-Higgs production cross sections at future high-energy e^+e^- colliders, such as ILC or CLIC. We consider two different channels for the neutral di-Higgs pairs h_i h_j=hh,hH,HH,AA: e^+e^- rightarrow h_i h_j Z and e^+e^- rightarrow h_i h_j nu {{bar{nu }}}. In both channels the various triple Higgs-boson couplings contribute substantially. We find regions with a strong enhancement of the production channel of two SM-like light Higgs bosons and/or with very large production cross sections involving one light and one heavy or two heavy 2HDM Higgs bosons, offering interesting prospects for the ILC or CLIC. The mechanisms leading to these enhanced production cross sections are analyzed in detail. We propose the use of cross section distributions with the invariant mass of the two final Higgs bosons where the contributions from intermediate resonant and non-resonant BSM Higgs bosons play a crucial role. We outline which process at which center-of-mass energy would be best suited to probe the corresponding triple Higgs-boson couplings.
Highlights
An important task at future colliders is the investigation of the Higgs-boson sector
Based on previous analyses [10], within the framework of Two Higgs Doublet Models (2HDM) type I and II we have analyzed several benchmark planes that are over large parts in agreement with all theoretical and experimental constraints
We have set all heavy Higgs-boson masses equal, m H = m A = m H± to simplify the analysis. For these planes we investigated the diHiggs production cross sections w.r.t. triple Higgs couplings at future high-energy e+e− colliders, such as ILC or CLIC
Summary
Within the 2HDM framework the largest effects of triple Higgs couplings on e+e− cross sections are expected to be found in double Higgs production These and other processes involving the 125 GeV Higgs boson at e+e− colliders have been explored in Refs. Our main focus in this paper is addressed to study not just the cross section as a function of the 2HDM parameters, and to explore the sensitivity to the various triple Higgs boson couplings via these two double Higgs production channels, at both ILC and CLIC. The calculation presented here of the total cross sections for these double Higgs production channels is performed in several two-dimensional benchmark planes (i.e. with all but two of the 2HDM parameters fixed), based on our results in Ref.
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