Dark Gauge Bosons: LHC Signatures of Non-Abelian Kinetic Mixing

Abstract

We consider non-abelian kinetic mixing between the Standard Model SU(2${)}_L$ and a dark sector U(1${)}^{\prime }$ gauge group associated with the presence of a scalar SU(2${)}_L$ triplet. The magnitude of the resulting dark photon coupling $\epsilon$ is determined by the ratio of the triplet vacuum expectation value, constrained to by $\lsim 4$ GeV by electroweak precision tests, to the scale $\Lambda$ of the effective theory. The corresponding effective operator Wilson coefficient can be $\mathcal{O}(1)$ 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.

12 pages, 5 figures

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• Singlet-Catalyzed Electroweak Phase Transitions and Precision Higgs Studies
• Vectorlike leptons at the Large Hadron Collider
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