Regular Article - Theoretical Physics
Exploring sizable triple Higgs couplings in the 2HDM
Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
2 Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
3 Campus of International Excellence UAM + CSIC, Cantoblanco, 28049, Madrid, Spain
4 Instituto de Física de Cantabria (CSIC-UC), 39005, Santander, Spain
Accepted: 20 August 2020
Published online: 24 September 2020
An important task at future colliders is the measurement of the triple Higgs coupling. Depending on its size relative to the Standard Model (SM) value, certain collider options result in a higher experimental accuracy. Within the framework of Two Higgs Doublet Models (2HDM) types 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, , can range between and . Depending on which value is realized, the HL-LHC can compete with, or is clearly inferior to the ILC. We find the coupling between and . Triple Higgs couplings involving two heavy Higgs bosons, , and can reach values up to , roughly independent of the 2HDM type. This can lead to potentially strongly enhanced production of two Higgs-bosons at the HL-LHC or high-energy colliders.
© The Author(s) 2020
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