Dark matter models with suppressed dark matter nuclei elastic cross section

We propose two generalizations of the dark photon model which predict the suppressed elastic dark matter nuclei cross section in comparison with the corresponding prediction of the dark photon model. In the first model the main difference from dark photon model is that the mixing parameter ϵ is nonlocal formfactor ϵ(q2)=q2Λ2V(q2Λ2) depending on the square of the momentum transfer q2. Here V(q2Λ2) is an entire function of the growth ρ≥12 and Λ is nonlocal scale. In this model our world and dark world are described by renormalizable field theories while the communication between them is performed by nonlocal interaction. The second model is renormalizable model where besides dark photon field A′ additional vector boson Z′ interacts with B−L current. The communication between our world and dark world is performed due to nonzero kinetic mixing between Z′ and A′ fields. The predictions of the models for the search for dark matter at the accelerators don't contain additional suppression factors.