Abstract
We investigate a double extension to the Standard Model (SM). A first extension introduces, via minimal coupling, a massive boson. This enlarged SM is coupled to a dark matter sector through the Stueckelberg mechanism by a boson. However, the boson does not interact directly with the SM fermions. In our study, we found that the is a massless photon-like particle in dark sector. Constraints on the mass for and corrections to mass are obtained.
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