Probing Benchmark Models of Hidden-Sector Dark Matter with DAMIC-M

We report on a search for sub-GeV dark matter (DM) particles interacting with electrons using the DAMIC-M prototype detector at the Modane Underground Laboratory. The data feature a significantly lower detector single

e^-

rate (factor 50) compared to our previous search, while also accumulating a ten times larger exposure of

\sim

1.3 kg-day. DM interactions in the skipper charge-coupled devices (CCDs) are searched for as patterns of two or three consecutive pixels with a total charge between 2 and 4

e^-

. We find 144 candidates of 2

e^-

and 1 candidate of 4

e^-

, where 141.5 and 0.071, respectively, are expected from background. With no evidence of a DM signal, we place stringent constraints on DM particles with masses between 1 and 1000 MeV/

c^2

interacting with electrons through an ultra-light or heavy mediator. For large ranges of DM masses below 1 GeV/c

^2

, we exclude theoretically-motivated benchmark scenarios where hidden-sector particles are produced as a major component of DM in the Universe through the freeze-in or freeze-out mechanisms.

Note:

The 90% C.L. exclusion upper limits reported in this publication are provided as text files in https://github.com/DAMIC-M/LBC_2025_HSBenchmark_Limits

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