Discerning secluded sector gauge structures
New fundamental particles, charged under new gauge groups and only weakly coupled to the standard sector, could exist at fairly low energy scales. In this article we study a selection of such models, where the secluded group either contains a softly broken U(1) or an unbroken SU(N). In the Abelian case new gamma(v) gauge bosons can be radiated off and decay back into visible particles. In the non-