Constraining the Higgs Trilinear Coupling from an Quadruplet with Bounded-from-Below Conditions
arXiv:2311.17995 · doi:10.1007/JHEP01(2024)176
Abstract
Integrating out a heavy scalar can cause the Higgs trilinear coupling to deviate from its Standard Model value: a good example is provided by an quadruplet. Constraints on the full theory, however, can limit the size of the deviation. We show that the bounded-from-below conditions for the Standard Model extended by an quadruplet strongly constrain the -breaking Higgs portal and can bound the Higgs trilinear coupling close to its Standard Model value. For TeV-scale quadruplet masses in models with custodial symmetry violation, these constraints can be a few times stronger than constraints from electroweak precision measurements. For the custodial quadruplet, these are the strongest theoretical constraints available.
arXiv comment22 pages, 1 figure, typos corrected, JHEP version
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