Reexamining the Solar Axion Explanation for the XENON1T Excess

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Christina Gao
  • Jia Liu
  • Lian-Tao Wang
  • Xiao-Ping Wang
  • Wei Xue

Detail(s)

Original languageEnglish
Article number131806
Journal / PublicationPhysical Review Letters
Volume125
Issue number13
Online published24 Sept 2020
Publication statusPublished - 25 Sept 2020
Externally publishedYes

Link(s)

Abstract

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. © 2020 authors. Published by the American Physical Society.

Research Area(s)

Citation Format(s)

Reexamining the Solar Axion Explanation for the XENON1T Excess. / Gao, Christina; Liu, Jia; Wang, Lian-Tao et al.
In: Physical Review Letters, Vol. 125, No. 13, 131806, 25.09.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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