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Triple Higgs couplings in the 2HDM

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Short Talks


Within the framework of 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 take into account theoretical
constraints (unitarity, stability), experimental constraints from
direct Higgs-boson searches, measurements of the SM-like Higgs-boson
properties, flavor observables and electroweak precision data. We find
that the SM-type triple Higgs coupling w.r.t.\ its SM value,
$\lambda_{hhh}/\lambda_{hhh}^{\rm SM}$, can range between $\sim -0.5$ and $\sim 1.5$. Depending on
which value is realized, the HL-LHC can compete with, or is clearly inferior
to the ILC. We also derive limits on the triple Higgs couplings involving heavy Higgs bosons.

Primary authors

Sven Heinemeyer (IFT (CSIC, Madrid)) Fran Arco (IFT (UAM/CSIC))

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