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arXiv 1609.01669hep-ph
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$^8Be$跃迁中17 MeV电子正电子反常的轻赝标解释

Possible Explanation of the Electron Positron Anomaly at 17 MeV in $^8Be$ Transitions Through a Light Pseudoscalar

Ulrich Ellwanger, Stefano Moretti

摘要:

我们估计的Yukawa耦合的质量约为17 MeV的轻赝标量A的值,这将解释的$^8Be$异常Atomki对光谱仪实验中观察到的。由此产生的A与上、下型夸克的耦合大约是标准希格斯玻色子耦合的0.3倍。然后,K和B衰减的约束要求循环对风味变化顶点的贡献至少在10%的水平上取消。来自束流收集器实验的约束要求A与电子的耦合大于标准希格斯玻色子的耦合的约4倍,导致足够短的A寿命与异常的解释一致。

英文摘要:

We estimate the values of Yukawa couplings of a light pseudoscalar A with a mass of about 17 MeV, which would explain the $^8Be$ anomaly observed in the Atomki pair spectrometer experiment. The resulting couplings of A to up and down type quarks are about 0.3 times the coupling of the standard Higgs boson. Then constraints from K and B decays require that loop contributions to flavour changing vertices cancel at least at the 10% level. Constraints from beam dump experiments require the coupling of A to electrons to be larger than about 4 times the coupling of the standard Higgs boson, leading to a short enough A life time consistent with an explanation of the anomaly.

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