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Even Lighter Particle Dark Matter

by Alvaro E. Chavarria

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Submission summary

Authors (as Contributors): Alvaro Chavarria
Submission information
Arxiv Link: (pdf)
Date submitted: 2022-10-12 06:42
Submitted by: Chavarria, Alvaro
Submitted to: SciPost Physics Proceedings
Proceedings issue: 14th International Conference on Identification of Dark Matter
Ontological classification
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
Approach: Experimental


We report on recent progress in the search for dark matter particles with masses from 1 MeV to 1 GeV. Several dark matter candidates in this mass range are expected to generate measurable electronic-recoil signals in direct-detection experiments. We focus on dark matter particles scattering with electrons in semiconductor detectors since they have fundamentally the highest sensitivity due to their low ionization threshold. Charge-coupled device (CCD) silicon detectors are the leading technology, with significant progress expected in the coming years. We present the status of the CCD program and briefly report on other efforts.

Current status:
Has been resubmitted

Submission & Refereeing History

Reports on this Submission

Anonymous Report 1 on 2022-11-17 (Invited Report)


The proceedings summarize nicely the CCD-based efforts to directly detect Dark Matter in the MeV-GeV mass bracket with a particular focus on the DAMIC experiment.


A small inaccuracy is to lump together Migdal effect and Bremsstrahlung in the introduction and to claim they are both down by a level of 10^-6 compared to DM-nuclear scattering. First, Migdal might be more frequent as stated and, second, there is also a hierarchy between both mentioned processes. The statement could hence be sharpened.

Other than that, the proceedings are fine to be published.

  • validity: high
  • significance: high
  • originality: good
  • clarity: good
  • formatting: good
  • grammar: excellent

Author:  Alvaro Chavarria  on 2022-12-30  [id 3195]

(in reply to Report 1 on 2022-11-17)
answer to question

I thank the reviewer for their comments. Indeed, the Migdal probability is higher than previously stated.
I updated Section 2 with separate sentences about the Migdal effect and the Bremsstrahlung process.

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