Abstract
We present an interesting Higgs portal model where an axion-like particle (ALP) couples to the Standard Model sector only via the Higgs field. The ALP becomes stable due to CP invariance and turns out to be a natural candidate for freeze-in dark matter because its properties are controlled by the perturbative ALP shift symmetry. The portal coupling can be generated non-perturbatively by a hidden confining gauge sector, or radiatively by new leptons charged under the ALP shift symmetry. Such UV completions generally involve a CP violating phase, which makes the ALP unstable and decay through mixing with the Higgs boson, but can be sufficiently suppressed in a natural way by invoking additional symmetries.
Highlights
Higgs Portal with Axion-like Dark MatterHaving properties controlled by the associated shift symmetry, an axion-like particle (ALP) coupled to the SM via a Higgs portal becomes a natural candidate for feebly interacting dark matter
Conserving minimum and becomes stable if it has no other non-derivative interactions
The portal coupling should be tiny to make the axion-like particle (ALP) not thermalized with SM particles since otherwise it would overclose the universe in most of the parameter space satisfying the experimental constraints on dark matter scattering with nuclei
Summary
Having properties controlled by the associated shift symmetry, an ALP coupled to the SM via a Higgs portal becomes a natural candidate for feebly interacting dark matter. We construct a portal model where the production of ALP dark matter takes place through freeze-in
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