Regular Article - Theoretical Physics
Maxi-sizing the trilinear Higgs self-coupling: how large could it be?
Department of Physics, Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, UK
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Accepted: 1 November 2017
Published online: 21 November 2017
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 self-coupling modifications above a factor of a few with respect to the Standard Model value.
© The Author(s), 2017