Regular Article - Theoretical Physics
On stability of the electroweak vacuum and the Higgs portal
DESY Theory Group, Notkestrasse 85, 22607, Hamburg, Germany
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Revised: 6 June 2012
Published online: 7 July 2012
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.
© Springer-Verlag / Società Italiana di Fisica, 2012