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arXiv 2102.01127hep-phnucl-exnucl-th
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“ATOMKI异常”的标准模型解释

A Standard Model Explanation for the "ATOMKI Anomaly"

A. Aleksejevs, S. Barkanova, Yu. G. Kolomensky, B. Sheff

摘要:

Krasznahorkay等人在匈牙利科学院核研究所(ATOMKI)的5 MV Van de Graaff加速器上使用$e^+e^-$对谱仪,声称在高$e^+e^-$开度角下,内部对产生等辉跃迁$^8\mathrm{Be}(18.15)\to\,^8\mathrm{Be}\,e^+e^-$中有6.8个$σ$过量。一个假设的规范玻色子的质量约为$17$ MeV,“X 17”,已被提出作为解释过剩。我们发现,所观察到的实验结构可以复制内的标准模型通过添加全套的二阶校正和干扰项的Born级衰减振幅考虑Krasznahorkay等人。我们实现了一个详细的模型的ATOMKI检测器,也表明如何实验选择和验收偏差加剧了实验数据和Born级预测之间的明显差异。

英文摘要:

Using the $e^+e^-$ pair spectrometer at the 5 MV Van de Graaff accelerator at the Institute for Nuclear Research, Hungarian Academy of Sciences (ATOMKI), Krasznahorkay et al. have claimed a 6.8$σ$ excess at high $e^+e^-$ opening angles in the internal pair creation isoscalar transition $^8\mathrm{Be}(18.15)\to\,^8\mathrm{Be}\,e^+e^-$. A hypothetical gauge boson with the mass circa $17$ MeV, "X17", has been proposed as an explanation for the excess. We show that the observed experimental structure can be reproduced within the Standard Model by adding the full set of second-order corrections and the interference terms to the Born-level decay amplitudes considered by Krasznahorkay et al. We implement a detailed model of the ATOMKI detector, and also show how experimental selection and acceptance bias exacerbate the apparent difference between the experimental data and the Born-level prediction.

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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