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Similar

Y. Chen, J. Shu, X. Xue, G. Yuan, and Q. Yuan, “Sun Heated MeV-scale Dark Matter and the XENON1T Electron Recoil Excess,” arXiv:2006.12447 [hep-ph]
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2006
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N. F. Bell, J. B. Dent, B. Dutta, S. Ghosh, J. Kumar, and J. L. Newstead, “Explaining the XENON1T excess with Luminous Dark Matter,” arXiv:2006.12461 [hep-ph]
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2006
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D. Aristizabal Sierra, V. De Romeri, L. Flores, and D. Papoulias, “Light vector mediators facing XENON1T data,” arXiv:2006.12457 [hep-ph]
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2006
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J. Buch, M. A. Buen-Abad, J. Fan, and J. S. C. Leung, “Galactic Origin of Relativistic Bosons and XENON1T Excess,” arXiv:2006.12488 [hep-ph]
Original
2006
Cited alongside, same era.
G. Choi, M. Suzuki, and T. T. Yanagida, “XENON1T Anomaly and its Implication for Decaying Warm Dark Matter,” arXiv:2006.12348 [hep-ph]

Then

I. M. Bloch, A. Caputo, R. Essig, D. Redigolo, M. Sholapurkar, and T. Volansky, “Exploring New Physics with O(keV) Electron Recoils in Direct Detection Experiments,” arXiv:2006.14521 [hep-ph]
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2006
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M. Chala and A. Titov, “One-loop running of dimension-six Higgs-neutrino operators and implications of a large neutrino dipole moment,” arXiv:2006.14596 [hep-ph]
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2006
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W. DeRocco, P. W. Graham, and S. Rajendran, “Exploring the robustness of stellar cooling constraints on light particles,” arXiv:2006.15112 [hep-ph]
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2006
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J. B. Dent, B. Dutta, J. L. Newstead, and A. Thompson, “Inverse Primakoff Scattering as a Probe of Solar Axions at Liquid Xenon Direct Detection Experiments,” arXiv:2006.15118 [hep-ph]
Original
2006
Later among the works it cites.

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2020

XENON1T excess in local $Z_2$ DM models with light dark sector

Baek, Seungwon, Kim, Jongkuk, Ko, P.

Understand

Recently XENON1T Collaboration announced that they observed some excess in the electron recoil energy around a 2-3 keV.

We show that this excess can be interpreted as exothermic scattering of excited dark matter (XDM), $XDM + e_{atomic} \rightarrow DM + e_{free}$ on atomic electron through dark photon exchange.
We consider DM models with local dark $U(1)$ gauge symmetry that is spontaneously broken into its $Z_2$ subgroup by Krauss-Wilczek mechanism.
In order to explain the XENON1T excess with the correct DM thermal relic density within freeze-out scenario, all the particles in the dark sector should be light enough, namely $\sim O(100)$ MeV for scalar DM and $\sim O(1-10)$ MeV for fermion DM cases.