26-30 July 2021
Europe/Berlin timezone

Large triple Higgs couplings in the 2HDM

27 Jul 2021, 11:12


Parallel session talk Higgs Physics T09: Higgs Physics


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


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.
Email francisco.arco@uam.es
First author Francisco Arco

Primary authors

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

Presentation Materials