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Loopholes in \(Z'\) searches at the LHC: exploring supersymmetric and leptophobic scenarios. (English) Zbl 1470.81058

Summary: Searching for heavy vector bosons \(Z'\), predicted in models inspired by Grand Unification Theories, is among the challenging objectives of the LHC. The ATLAS and CMS collaborations have looked for \(Z'\) bosons assuming that they can decay only into Standard Model channels, and have set exclusion limits by investigating dilepton, dijet and, to a smaller extent, top-antitop final states. In this work we explore possible loopholes in these \(Z'\) searches, by studying supersymmetric as well as leptophobic scenarios. We demonstrate the existence of realizations in which the \(Z'\) boson automatically evades the typical bounds derived from the analyses of the Drell-Yan invariant-mass spectrum. Dileptonic final states can in contrast only originate from supersymmetric \(Z'\) decays and are thus accompanied by additional effects. This feature is analyzed in the context of judiciously chosen bench-mark configurations, for which visible signals could be expected in future LHC data with a 4\(\sigma\) - 7\(\sigma\) significance. Our results should hence motivate an extension of the current \(Z'\) search program to account for supersymmetric and leptophobic models.

MSC:

81V15 Weak interaction in quantum theory
81Q60 Supersymmetry and quantum mechanics
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