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Implications of the XENON1T excess on the dark matter interpretation

A preprint version of the article is available at arXiv.

Abstract

The dark matter interpretation for a recent observation of excessive electron recoil events at the XENON1T detector seems challenging because its velocity is not large enough to give rise to recoiling electrons of \( \mathcal{O}\left(\mathrm{keV}\right) \). Fast-moving or boosted dark matter scenarios are receiving attention as a remedy for this issue, rendering the dark matter interpretation a possibility to explain the anomaly. We investigate various scenarios where such dark matter of spin 0 and 1/2 interacts with electrons via an exchange of vector, axial-vector, pseudo-scalar, or scalar mediators. We find parameter values not only to reproduce the excess but to be consistent with existing bounds. Our study suggests that the scales of mass and coupling parameters preferred by the excess can be mostly affected by the type of mediator, and that significantly boosted dark matter can explain the excess depending on the mediator type and its mass choice. The method proposed in this work is general, and hence readily applicable to the interpretation of observed data in the dark matter direct detection experiment.

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Correspondence to Seodong Shin.

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Alhazmi, H., Kim, D., Kong, K. et al. Implications of the XENON1T excess on the dark matter interpretation. J. High Energ. Phys. 2021, 55 (2021). https://doi.org/10.1007/JHEP05(2021)055

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Keywords

  • Beyond Standard Model
  • Cosmology of Theories beyond the SM