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Vector portals at future lepton colliders
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DOI：10.1007/JHEP08(2025)029.png)
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Abstract
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We assess the sensitivity of future lepton colliders to weakly coupled vector dark portals (aka “Z′ bosons”) with masses ranging from tens of GeV to a few TeV. Our analysis focuses on dark photons and Lμ – Lτ gauge bosons. We consider both visible and invisible decay channels. We demonstrate that both high energy μ colliders and future e+e− colliders, using the FCC-ee Z-pole and ZH operation modes as a benchmark, offer significant improvements in sensitivity. We find that both colliders can enhance the sensitivity to Lμ – Lτ bosons (for both visible and invisible decays) and to invisibly decaying dark photons by 1–2 orders of magnitude across the relevant mass range. Furthermore, we study the impact of forward μ detectors at the μ-collider on the sensitivity to both models.
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