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arXiv 1612.06985hep-ph
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利用稀有轻子K介子和π介子衰变探测暗光子

Probing a dark photon using rare leptonic kaon and pion decays

Cheng-Wei Chiang, Po-Yan Tseng

摘要:

稀有的轻子K介子和π介子衰变$K^+(π^+) \to μ^+\, ν_μ\, e^+ e^-$可以用来探测质量为${\cal O}(10)$ ~MeV的暗光子,其背景来自虚光子。这是最相关的16.7兆电子伏的暗光子提出来解释最近观察到的6.8 $σ$异常$^8$ Be跃迁的原子基合作。我们评估了未来的实验如何与标准模型粒子的暗光子耦合的不同方案的范围,并表明,很大一部分的首选16.7兆电子伏暗光子参数空间可以果断地探测。我们还展示了使用角分布来进一步区分信号与背景。

英文摘要:

Rare leptonic kaon and pion decays $K^+(π^+) \to μ^+\, ν_μ\, e^+ e^-$ can be used to probe a dark photon of mass ${\cal O}(10)$~MeV, with the background coming from the mediation of a virtual photon. This is most relevant for the 16.7-MeV dark photon proposed to explain a 6.8$σ$ anomaly recently observed in $^8$Be transitions by the Atomki Collaboration. We evaluate the reach of future experiments for different scenarios of how the dark photon couples with the standard model particles, and show that a great portion of the preferred 16.7-MeV dark photon parameter space can be decisively probed. We also show the use of angular distributions to further distinguish the signal from the background.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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