Dark gauge bosons: LHC signatures of non-abelian kinetic mixing

We consider non-abelian kinetic mixing between the Standard Model SU(2)(L) and a dark sector U(1)' gauge group associated with the presence of a scalar SU(2)(L) triplet. The magnitude of the resulting dark photon coupling is an element of is determined by the ratio of the triplet vacuum expectation value, constrained to by less than or similar to 4 GeV by electroweak precision tests, to the scale Lambda of the effective theory. The corresponding effective operator Wilson coefficient can be O(1) while accommodating null results for dark photon searches, allowing for a distinctive LHC dark photon phenomenology. After outlining the possible LHC signatures, we illustrate by recasting current ATLAS dark photon results into the non-abelian mixing context. (C) 2017 The Authors. Published by Elsevier B.V.