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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.
Forward citations
Cited by 4 Pith papers
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Constraining the heavy leptophilic neutral gauge bosons through the $Z\to\ell^+\ell^-$, $W^\pm\to\ell^\pm\nu_\ell$, and $h\to\ell^+\ell^-$ decays
One-loop corrections to W/Z/h leptonic widths exclude heavy leptophilic Z' regions (M ≳ O(1) TeV, g' ≳ 0.4) beyond LEP-2 and neutrino-trident limits.
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Phenomenology of Leptophilic Gauge Interactions at Future $e^+e^-$ Colliders
Interference-driven forward-backward asymmetry at FCC-ee, CEPC, ILC, and CLIC can probe leptophilic Z_ℓ beyond LEP contact bounds, with circular and linear machines covering complementary (M,g) regions.
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ALP and $Z^\prime$ boson at the Electron-Ion collider
Projected EIC tri-electron searches would constrain electron-coupled ALPs and Z' bosons more strongly than current experiments at masses of about 10-100 GeV and 10-30 GeV, respectively.
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Searching for the Leptophilic Gauge Boson Z$_{l}$ at Future $e^{+}e^{-}$ Colliders
A parton-level projection shows FCC-ee and CEPC can discover a leptophilic Z' down to g_l about 10^-4, while ILC and CLIC extend the search to TeV-scale masses.
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