3 research outputs found
Z-portal dark matter
We propose to generalize the extensions of the Standard Model where the Z
boson serves as a mediator between the Standard Model sector and the dark sector . We
show that, like in the Higgs portal case, the combined constraints from the recent direct
searches restrict severely the nature of the coupling of the dark matter to the Z boson
and set a limit m & 200 GeV (except in a very narrow region around the Z-pole region).
Using complementarity between spin dependent, spin independent and FERMI limits, we
predict the nature of this coupling, more speci cally the axial/vectorial ratio that respects
a thermal dark matter coupled through a Z-portal while not being excluded by the current
observations. We also show that the next generation of experiments of the type LZ or
XENON1T will test Z-portal scenario for dark matter mass up to 2TeV. The condition of
a thermal dark matter naturally predicts the spin-dependent scattering cross section on the
neutron to be SD
n ' 1040 cm2, which then becomes a clear prediction of the model and a
signature testable in the near future experiments.peerReviewe