Forward-backward asymmetry and a new interference-normalized observable I_FB can probe off-shell leptophilic Z_ℓ bosons at future e+e- colliders, with complementary reach from circular and linear machines.
Leptophilic Z′ bosons at the FCC-ee: discovery opportunities
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abstract
We examine the possibility to detect new SM-neutral vector bosons ($Z'$) that couple exclusively to leptons in the electron-positron mode of the Future Circular Collider (FCC-ee). Focusing on the $Z'$ production with a radiated photon search channel, we show that the FCC-ee can significantly extend the unprobed parameter space by increasing the exclusion in the coupling by one to two orders of magnitude in the kinematically allowed mass range (from 10 GeV to 365 GeV), with the leading sensitivity being driven by the muon channel. In doing so, it outperforms other proposed lepton collider options such as CLIC and ILC in this range of masses. Further, we discuss the possibility of improving the sensitivity of the FCC-ee to this model through the modification of the dilepton invariant mass resolution and the photon energy resolution. The impact of systematic uncertainties on the expected sensitivities is also studied.
representative citing papers
The FCC feasibility study describes how a staged electron-positron and hadron collider could deliver precision measurements on the Higgs, electroweak bosons, and top quark while searching for physics beyond the Standard Model.
citing papers explorer
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Phenomenology of Leptophilic Gauge Interactions at Future $e^+e^-$ Colliders
Forward-backward asymmetry and a new interference-normalized observable I_FB can probe off-shell leptophilic Z_ℓ bosons at future e+e- colliders, with complementary reach from circular and linear machines.
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Future Circular Collider Feasibility Study Report: Volume 1, Physics, Experiments, Detectors
The FCC feasibility study describes how a staged electron-positron and hadron collider could deliver precision measurements on the Higgs, electroweak bosons, and top quark while searching for physics beyond the Standard Model.