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<p>The decay of the <i>Z</i> boson into axion-like particles (ALP) at the <i>Z</i>-pole run of the proposed CERN FCC-ee collider is investigated. We perform a detailed study of final states with three photons or with a single photon and missing energy, yielding an evaluation of the accessible values of the ALP coupling to the photon for ALP masses between 0.1 and 85 GeV. Special attention is paid to the experimental implications of detecting the three-photon signature for the ALP mass region below 10 GeV. The FCC-ee run will be able to detect the ALP for couplings down to a few 10<sup>−3</sup> TeV<sup>−1</sup> over the considered mass range in an effective model where the ALP only couples to the U(1) boson of the Standard Model.</p>

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Sensitivity of the FCC-ee to decay of an axion-like particle into two photons

  • 期刊论文

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  • 发表日期：

    2025年6月25日

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  • G. Polesello

摘要

The decay of the Z boson into axion-like particles (ALP) at the Z-pole run of the proposed CERN FCC-ee collider is investigated. We perform a detailed study of final states with three photons or with a single photon and missing energy, yielding an evaluation of the accessible values of the ALP coupling to the photon for ALP masses between 0.1 and 85 GeV. Special attention is paid to the experimental implications of detecting the three-photon signature for the ALP mass region below 10 GeV. The FCC-ee run will be able to detect the ALP for couplings down to a few 10−3 TeV−1 over the considered mass range in an effective model where the ALP only couples to the U(1) boson of the Standard Model.