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<p>We assess the sensitivity of future lepton colliders to weakly coupled vector dark portals (aka “<i>Z</i><sup>′</sup> bosons”) with masses ranging from tens of GeV to a few TeV. Our analysis focuses on dark photons and <i>L</i><sub><i>μ</i></sub> – <i>L</i><sub><i>τ</i></sub> gauge bosons. We consider both visible and invisible decay channels. We demonstrate that both high energy <i>μ</i> colliders and future <i>e</i><sup>+</sup><i>e</i><sup>−</sup> colliders, using the FCC-ee <i>Z</i>-pole and <i>ZH</i> operation modes as a benchmark, offer significant improvements in sensitivity. We find that both colliders can enhance the sensitivity to <i>L</i><sub><i>μ</i></sub> – <i>L</i><sub><i>τ</i></sub> 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 <i>μ</i> detectors at the <i>μ</i>-collider on the sensitivity to both models.</p>

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Vector portals at future lepton colliders

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月4日

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  • Sagar Airen,
  • Edward Broadberry,
  • Gustavo Marques-Tavares,
  • Lorenzo Ricci

摘要

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.