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<p>Dark axion portal connects an axion-like-particle (ALP), which can be the QCD axion, with the SM by the coupling to a photon and a dark photon, leading to a rich and distinct phenomenology related to dark matter, astrophysics, and cosmology. We note that due to the gauge invariance, the <i>Z</i> boson-dark photon-ALP coupling should also be generated with sizable strength, and we study its phenomenological consequences at <i>Z</i> boson factories: LEP, FCC-ee, and forward physics detectors at the LHC and FPF@FCC - FASER and MATHUSLA. Due to the large number of <i>Z</i> bosons produced, DAP particles can be efficiently produced and detected by semi-visible displaced decays of the heavier DS species to <i>γ</i>+inv. or <i>f</i> <sup>+</sup><i>f</i><sup><i>−</i></sup>+inv., and via missing energy signature with zero or one photon. Because of the complementarity of the two approaches, we find great prospects in exploring both short and long-lived lifetime regimes of DAP, especially when the heavier dark species has mass above 0.1 GeV.</p>

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Dark axion portal at Z boson factories

  • 期刊论文

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  • 发表日期：

    2025年8月4日

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  • Krzysztof Jodłowski

摘要

Dark axion portal connects an axion-like-particle (ALP), which can be the QCD axion, with the SM by the coupling to a photon and a dark photon, leading to a rich and distinct phenomenology related to dark matter, astrophysics, and cosmology. We note that due to the gauge invariance, the Z boson-dark photon-ALP coupling should also be generated with sizable strength, and we study its phenomenological consequences at Z boson factories: LEP, FCC-ee, and forward physics detectors at the LHC and FPF@FCC - FASER and MATHUSLA. Due to the large number of Z bosons produced, DAP particles can be efficiently produced and detected by semi-visible displaced decays of the heavier DS species to γ+inv. or f +f−+inv., and via missing energy signature with zero or one photon. Because of the complementarity of the two approaches, we find great prospects in exploring both short and long-lived lifetime regimes of DAP, especially when the heavier dark species has mass above 0.1 GeV.