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2015

A second Higgs from the Higgs portal

Falkowski, Adam, Gross, Christian, Lebedev, Oleg

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In the Higgs portal framework, the Higgs field generally mixes with the Standard Model singlet leading to the existence of two states, one of which is identified with the 125 GeV scalar observed at the LHC.

In this work, we analyse direct and indirect constraints on the second mass eigenstate and the corresponding mixing angle.
The existence of the additional scalar can be beneficial as it can stabilise the otherwise-metastable electroweak vacuum.
We find parameter regions where all of the bounds, including the stability constraints, are satisfied.

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