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On stability of the electroweak vacuum and the Higgs portal

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Abstract

In the Standard Model (SM), the Higgs mass around 125 GeV implies that the electroweak vacuum is metastable since the quartic Higgs coupling turns negative at high energies. I point out that a tiny mixing of the Higgs with a heavy singlet can make the electroweak vacuum completely stable. This is due to a tree level correction to the Higgs mass-coupling relation, which survives in the zero-mixing/heavy-singlet limit. Such a situation is experimentally indistinguishable from the SM, unless the Higgs self-coupling can be measured. As a result, Higgs inflation and its variants can still be viable.

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Acknowledgement

The author is grateful to H.M. Lee for useful comments.

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Authors and Affiliations

  1. DESY Theory Group, Notkestrasse 85, 22607, Hamburg, Germany

    Oleg Lebedev

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  1. Oleg Lebedev
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Correspondence to Oleg Lebedev.

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Lebedev, O. On stability of the electroweak vacuum and the Higgs portal. Eur. Phys. J. C 72, 2058 (2012). https://doi.org/10.1140/epjc/s10052-012-2058-2

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  • DOI: https://doi.org/10.1140/epjc/s10052-012-2058-2

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