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Reexamining the Solar Axion Explanation for the XENON1T Excess
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-09-24 , DOI: 10.1103/physrevlett.125.131806
Christina Gao , Jia Liu , Lian-Tao Wang , Xiao-Ping Wang , Wei Xue , Yi-Ming Zhong

The XENON1T collaboration has observed an excess in electronic recoil events below 5 keV over the known background, which could originate from beyond-the-standard-model physics. The solar axion is a well-motivated model that has been proposed to explain the excess, though it has tension with astrophysical observations. The axions traveling from the Sun can be absorbed by the electrons in the xenon atoms via the axion-electron coupling. Meanwhile, they can also scatter with the atoms through the inverse Primakoff process via the axion-photon coupling, which emits a photon and mimics the electronic recoil signals. We found that the latter process cannot be neglected. After including the keV photon produced via the inverse Primakoff process in the detection, the tension with the astrophysical constraints can be significantly reduced. We also explore scenarios involving additional new physics to further alleviate the tension with the astrophysical bounds.

中文翻译:

重新检查XENON1T多余的太阳轴说明

XENON1T合作发现,在已知背景下,电子反冲事件超过5 keV,这可能是由于超出标准模型的物理学所致。太阳轴是一个动机良好的模型,尽管它对天体物理观测有张力,但已提出来解释其过量现象。从太阳传播的轴可以通过轴-电子耦合被氙原子中的电子吸收。同时,它们还可以通过轴-光子耦合通过Primakoff逆过程与原子散射,从而发射光子并模拟电子反冲信号。我们发现,后一个过程不可忽视。在检测中包含通过反向Primakoff过程产生的keV光子后,具有天体物理约束的张力可以显着降低。
更新日期:2020-09-24
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