A second Higgs from the Higgs portal

Abstract

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. We also study prospects for observing the decay of the heavier state into a pair of the 125 GeV Higgs-like scalars.

16 pages, updated figures 3 and 4 with new limits from Higgs-searches at the LHC, minor text adjustments, references added

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• SUSY Meets Her Twin
• On thermal production of self-interacting dark matter
• Implications of Two-component Dark Matter Induced by Forbidden Channels and Thermal Freeze-out
• Dark matter amnesia in out-of-equilibrium scenarios
• Analyzing of singlet fermionic dark matter via the updated direct detection data
• Higgs interference effects at the one-loop level in the 1-Higgs-Singlet extension of the Standard Model
• Towards a Higgs mass determination in asymptotically safe gravity with a dark portal
• One-loop corrections for Higgs-portal dark matter
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model
• Light scalars in neutron star mergers