Triple Higgs Couplings in the 2HDM: The Complete Picture

TL;DR

This paper thoroughly analyzes the allowed ranges of triple Higgs couplings in the 2HDM framework, considering theoretical and experimental constraints, with implications for future collider experiments.

Contribution

It provides the first comprehensive update of triple Higgs coupling ranges in all 2HDM types, including newly analyzed type III and IV, under current constraints.

Findings

Allowed range for SM-like triple Higgs coupling: [-0.5, 1.3] in type I and [0.5, 1.0] in others.

Coupling λ_{hhH} ranges from -1.5 to +1.5 across all types.

Large potential values for couplings involving heavy Higgs bosons, up to 32, indicating possible enhanced production.

Abstract

The measurement of the triple Higgs coupling is one of the main tasks of the (HL-)LHC and future lepton colliders. Similarly, triple Higgs couplings involving BSM Higgs bosons are of high interest. Within the framework of Two Higgs Doublet Models (2HDM) we investigate the allowed ranges for all triple Higgs couplings involving at least one light, SM-like Higgs boson. We present newly the allowed ranges for 2HDM type III and IV and update the results within the type I and II. We take into account theoretical constraints from unitarity and stability, experimental constraints from direct BSM Higgs-boson searches, measurements of the rates of the SM-like Higgs-boson at the LHC, as well as flavor observables and electroweak precision data. For the SM-type triple Higgs coupling w.r.t. its SM value, $\lambda_{hhh}/\lambda_{hhh}^\mathrm{SM}$, we find allowed intervals of $\sim [-0.5,1.3]$ in type~I and $\sim [0.5,1.0]$ in the other Yukawa types. These allowed ranges have important implications for the experimental determination of this coupling at future collider experiments. We find the coupling $\lambda_{hhH}$ between $\sim -1.5$ and $\sim +1.5$ in the four Yukawa types. For the triple Higgs couplings involving two heavy neutral Higgs bosons, $\lambda_{hHH}$ and $\lambda_{hAA}$ we find values between $\sim -0.5$ and $\sim 16$, and between $\sim -1$ and $\sim 32$ for $\lambda_{hH^+H^-}$. These potentially large values could lead to strongly enhanced production of two Higgs-bosons at the HL-LHC or high-energy lepton colliders.