Specific Dark Matter signatures from hidden U(1)

TL;DR

This paper explores specific signatures of a hidden U(1) gauge boson in dark matter models, highlighting potential signals in gamma-ray observations and parameter regions not yet excluded by experiments.

Contribution

It presents new predictions for dark matter signatures from a hidden U(1) gauge boson, including gamma-ray lines and viable parameter space for light WIMPS.

Findings

Light WIMPS with specific mass and mixing parameters are not excluded by current data.

Anomaly cancellation leads to tri-vector couplings producing gamma-ray lines.

Potential signals detectable by FERMI telescope.

Abstract

Several constructions motivate the existence of a dark $U(1)_D$ gauge boson which interacts with the Standard Model only through its kinetic mixing or loop induced processes. We describe two typical examples with specific signatures in particular we show that a region with relatively light WIMPS, $M_{Z_D}\lsim 40$ GeV and a kinetic mixing $10^{-4} \lsim \delta \lsim 10^{-3} $ is not yet excluded by the last experimental data and seems to give promising signals in a near future. We also show that conditions from anomaly cancelation generate tri-vector couplings $Z_D Z \gamma$ leading to a specific gamma ray line observable by FERMI telescope.