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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Large triple Higgs couplings in the 2HDM

Jul 27, 2021, 11:12 AM
17m
Zoom

#### Zoom

Parallel session talk Higgs Physics

### Speaker

Francisco Arco Garcia (Instituto de Física Teórica (IFT-UAM))

### Description

An important task at future colliders is the investigation of the Higgs-boson sector. Within the framework of the $CP$ conserving Two Higgs Doublet Models (2HDM) type I and II we investigate the allowed ranges for all triple Higgs couplings involving at least one light, SM-like Higgs boson. We will define and explore some benchmark planes that show large values of triple Higgs couplings, still in agreement with all the relevant theoretical and experimental constraints. We find that the SM-type triple Higgs coupling w.r.t. its SM value, $\kappa_{\lambda}:=\lambda_{hhh}/\lambda_{\mathrm{SM}}$, can range between $\sim-0.5$ and $\sim1.5$ in type I and between $\sim0$ and $\sim1$ in type II. We find the coupling $\lambda_{hhH}$ between $\sim\pm$1.5 and triple Higgs couplings involving two heavy Higgs bosons, $\lambda_{hHH}$, $\lambda_{hAA}$ and $\lambda_{hH^{+}H^{-}}$ can reach values up to $O(10)$, roughly independent of the 2HDM type. Finally, we will comment on the possible phenomenological consequences of this results, focusing on double Higgs production in future $e^{+}e^{-}$ colliders.

Collaboration / Activity Higgs physics and BSM physics. Francisco Arco francisco.arco@uam.es

### Primary authors

Francisco Arco Garcia (Instituto de Física Teórica (IFT-UAM)) Sven Heinemeyer (IFCA (CSIC, Santander)) Maria Jose Herrero Solans (Universidad Autónoma de Madrid)