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    • Searches for the Light Invisible Axion-Like Particle in K^+→π^+π^0a Decay

    EUROPEAN PHYSICAL JOURNAL C（2024）

    NRC “Kurchatov Institute”-IHEP | Joint Institute of Nuclear Research | Institute for Nuclear Research-Russian Academy of Sciences

    Cited 0|Views23
    Abstract
    A high-statistics data sample of the K^+ decays is recorded by the OKA collaboration. A missing mass analysis is performed to search for a light invisible pseudoscalar axion-like particle (ALP) a in the decay K^+→π ^+π ^0 a . No signal is observed, and the upper limits for the branching ratio of the decay are calculated. The 90% confidence level upper limit changes from 2.5· 10^-6 to 2· 10^-7 for the ALP mass from 0 to 200 MeV/ c^2 , except for the region of π ^0 mass, where the upper limit is 4.4· 10^-6 .
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    Baryon Acoustic Oscillations
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    【要点】：该论文通过高统计量的数据样本，利用缺失质量分析方法，在K+衰变中寻找轻不可见 pseudoscalar axion-like particle (ALP)，并计算了衰变分支比的90%置信上限。
    

    【方法】：研究采用了OKA合作组织记录的高统计量K(+)衰变数据样本，并通过缺失质量分析来寻找轻不可见的 pseudoscalar axion-like particle (ALP)。
    

    【实验】：实验在K+->pi(+)pi(0)a衰变过程中未观察到信号，计算得到的ALP衰变分支比的90%置信水平上限随ALP质量从0到200 MeV/c^2的变化从2.5×10^-6降低到2×10^-7，除了pi(0)质量区域，该区域的上限为4.4×10^-6。
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