We consider a model of sub-GeV dark matter whose interaction with the Standard Model is mediated by a new vector boson (the dark photon) which couples kinetically to the photon. We describe the possibility of constraining such a model using a superfluid He-4 detector, by means of an effective theory for the description of the superfluid phonon. We find that such a detector could provide bounds that are competitive with other direct detection experiments only for ultralight vector mediator, in agreement with previous studies. As a byproduct we also present, for the first time, the low-energy effective field theory for the interaction between photons and phonons.
We present a global analysis of the Higgs and electroweak sector,
in the SMEFT framework and matched to a UV-completion. As the UV-model
we use the triplet extension of the electroweak gauge sector. The
matching is performed at one loop, employing functional methods. In
the SFitter analysis, we pay particular attention to theory
uncertainties arising from the matching. Our results highlight the
complementarity between SMEFT and model-specific analyses.
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