Higgs boson production at Linear Colliders from a generic 2HDM: the role of triple Higgs self-interactions

TL;DR

This paper analyzes Higgs boson production at Linear Colliders within the general 2HDM, highlighting significant quantum effects driven by triple Higgs self-interactions that distinguish it from other models like the MSSM.

Contribution

It demonstrates the potential of large Higgs production rates and quantum effects as signatures of the 2HDM, emphasizing the role of triple Higgs self-interactions.

Findings

Production rates of 10-100 fb at 0.5 TeV energy

Quantum effects up to 50% enhancement

Distinct phenomenological profile from MSSM

Abstract

We review selected results for Higgs boson production at Linear Colliders in the framework of the general Two-Higgs-Doublet Model (2HDM). We concentrate on the analysis of i) the pairwise production of neutral Higgs bosons (hA,HA); and ii) the neutral Higgs boson-strahlung modes (hZ, HZ). We identify sizable production rates, in the range of 10-100 fb for center-of-mass energies of 0.5 TeV, alongside with large quantum effects (up to 50 %), which we can fundamentally track down to the enhancement power of the triple-Higgs self-interactions. This constitutes a telltale signature of the 2HDM, with no counterpart in e.g. the Minimal Supersymmetric Standard Model (MSSM). We compare these results with several complementary double and triple Higgs-boson production mechanisms at order O(\alpha^3_{ew})-O(\alpha^4_{ew} and spotlight a characteristic phenomenological profile which could eventually be highly distinctive of a non-supersymmetric two-Higgs-doublet structure.