Two Higgs doublet models with local U(1)H gauge symmetry and dark matter
Abstract
We propose to implement the softly broken Z2 symmetry in the usual two Higgs doublet model (2HDM) to spontaneously broken local U(1)H gauge symmetry, and show that the resulting phenomenology can be very rich and is distinctly different from the usual 2HDMs. Likewise, the exact Z2 symmetry in ordinary inert doublet model (IDM) could be a remnant of spontaneously broken local U(1)H symmetry stabilizing dark matter (DM). In this case, new channels for DM pair annihilation into U(1)H gauge boson(s) open up, allowing the DM mass below 40 GeV, unlike the usual IDM.
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