Higgs–inflaton mixing and vacuum stability

The quartic and trilinear Higgs field couplings to an additional real scalar are renormalizable, gauge and Lorentz invariant. Thus, on general grounds, one expects such couplings between the Higgs and an inflaton in quantum field theory. We find that the often omitted trilinear interaction is only w...

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Bibliographic Details
Published in:Physics letters. B 2019-02, Vol.789, p.373-377
Main Authors: Ema, Yohei, Karčiauskas, Mindaugas, Lebedev, Oleg, Rusak, Stanislav, Zatta, Marco
Format: Article
Language:English
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Summary:The quartic and trilinear Higgs field couplings to an additional real scalar are renormalizable, gauge and Lorentz invariant. Thus, on general grounds, one expects such couplings between the Higgs and an inflaton in quantum field theory. We find that the often omitted trilinear interaction is only weakly constrained by cosmology and could stabilize the electroweak vacuum by increasing the Higgs self-coupling. The consequent Higgs–inflaton mixing can be as large as order one making a direct inflaton search possible at the LHC.
ISSN:0370-2693
1873-2445
1873-2445
DOI:10.1016/j.physletb.2018.10.074