PT Journal
AU Caputo, A
   Esposito, A
   Geoffray, E
   Polosa, AD
   Sun, SC
TI Dark matter, dark photon and superfluid He-4 from effective field theory
SO Physics Letters B
JI Phys. Lett. B
PY 2020
BP 135258
EP 6pp
VL 802
DI 10.1016/j.phystab.2020.135258
LA English
DE Light dark matter; Effective theory; Helium; Phonon; Dark photon
AB 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.
ER