Triple Higgs coupling in the most general 2HDM at SM-like scenario

Ginzburg, Ilya F.

doi:10.1140/epjc/s10052-016-4559-x

Cited by 7 publications

(1 citation statement)

References 49 publications

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“…The question of the trilinear Higgs self-coupling was addressed in detail in the context of the Z 2 symmetric case [86,87], where it was shown that the expected deviations are well below those allowed in the general singlet model. On the other hand, a full study in the context of the general 2HDM (including the ΦHH † H † tadpole operator) is still missing to our knowledge (see however [88] for a qualitative study). In such a case we expect potentially large deviations.…”

Section: Resultsmentioning

confidence: 99%

Maxi-sizing the trilinear Higgs self-coupling: how large could it be?

2017

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In order to answer the question on how much the trilinear Higgs self-coupling could deviate from its Standard Model value in weakly coupled models, we study both theoretical and phenomenological constraints. As a first step, we discuss this question by modifying the Standard Model using effective operators. Considering constraints from vacuum stability and perturbativity, we show that only the latter can be reliably assessed in a model-independent way. We then focus on UV models which receive constraints from Higgs coupling measurements, electroweak precision tests, vacuum stability and perturbativity. We find that the interplay of current measurements with perturbativity already excludes selfcoupling modifications above a factor of a few with respect to the Standard Model value.

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Section: Resultsmentioning

confidence: 99%

Maxi-sizing the trilinear Higgs self-coupling: how large could it be?

2017

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Charting the Higgs self-coupling boundaries

Durieux

McCullough

Salvioni

2022

J. High Energ. Phys.

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Could new physics first manifest itself in Higgs self-coupling measurements? In other words, how large could deviations in the Higgs self-coupling be, if other Higgs and electroweak measurements are compatible with Standard Model predictions? Using theoretical arguments supported by concrete models, we derive a bound on the ratio of self-coupling to single-Higgs coupling deviations in ultraviolet completions of the Standard Model where parameters are not fine-tuned. Broadly speaking, a one-loop hierarchy is allowed. We thus stress that self-coupling measurements at the LHC and future colliders probe uncharted parameter space, presenting discovery potential even in the absence of emerging hints in single-Higgs coupling measurements. For instance, if other observables show less than two-sigma deviations by the end of the LHC programme, the Higgs self-coupling deviations could still exceed 200% in the models discussed, without introducing fine-tuning of ultraviolet parameters.

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