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    • Search for Leptonic Decays of Dark Photons at NA62

    PHYSICAL REVIEW LETTERS（2024）

    Catholic Univ Louvain | TRIUMF | Charles Univ Prague | Aix Marseille Univ | Max Planck Inst Phys & Astrophys | Johannes Gutenberg Univ Mainz | Univ Ferrara | INFN | Univ Firenze | Lab Nazl Frascati | Dipartimento Fis Ettore Pancini | Univ Perugia | Univ Pisa | Sapienza Univ Roma | Univ Turin | Univ Autonoma San Luis Potosi | Horia Hulubei Natl Inst R&D Phys & Nucl Engn | Comenius Univ | CERN | Univ Birmingham | Univ Bristol | Univ Glasgow | Univ Lancaster | George Mason Univ

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    Abstract
    The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of 1.4×1017 protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton–antilepton final states is presented and a region of the parameter space is excluded at 90% confidence level, improving on previous experimental limits for dark photon mass values between 50 and 600 MeV/c2 and coupling values in the range 10−6 to 4×10−5. An interpretation of the e+e− search result in terms of the emission and decay of an axionlike particle is also presented. Published by the American Physical Society 2024
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    Neutron Lifetime Measurement
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    【要点】：NA62实验在CERN利用 beam-dump 模式搜索暗光子衰变成电子-正电子对的现象，未发现信号，并排除了部分参数空间，提高了对暗光子质量与耦合强度的限制。
    

    【方法】：实验通过分析质子束打击靶产生的数据样本，利用高能物理实验技术搜索特定衰变模式的暗光子信号。
    

    【实验】：在2021年收集的1.4×10^17质子打击靶的数据样本中进行分析，未观察到暗光子信号，使用的数据集名称未在文本中提及，结果排除了50至600 MeV/c^2质量范围和10^-6至4×10^-5耦合范围的暗光子存在可能性。
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