Search for Daily Modulation of MeV Dark Matter Signals with DAMIC-M

Arnquist, I.; Avalos, N.; Baxter, D.; Bertou, X.; Castello-Mor, N.; Chavarria, A.E.; Cuevas-Zepeda, J.; Dastgheibi-Fard, A.; De Dominicis, C.; Deligny, O.

doi:10.1103/PhysRevLett.132.101006

Search for Daily Modulation of MeV Dark Matter Signals with DAMIC-M

DAMIC-M

Collaboration

•

I. Arnquist
(
- PNL, Richland
)

Jul 14, 2023

8 pages

Published in:

Phys.Rev.Lett. 132 (2024) 10, 101006

Published: Mar 7, 2024

e-Print:

2307.07251 [hep-ex]

DOI:

10.1103/PhysRevLett.132.101006 (publication)

Experiments:

View in:

pdf

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Abstract: (APS)

Dark matter (DM) particles with sufficiently large cross sections may scatter as they travel through Earth’s bulk. The corresponding changes in the DM flux give rise to a characteristic daily modulation signal in detectors sensitive to DM-electron interactions. Here, we report results obtained from the first underground operation of the DAMIC-M prototype detector searching for such a signal from DM with MeV-scale mass. A model-independent analysis finds no modulation in the rate of

1 e^{-}

events with sidereal period, where a DM signal would appear. We then use these data to place exclusion limits on DM in the mass range

[0.53, 2.7] MeV / c^{2}

interacting with electrons via a dark photon mediator. Taking advantage of the time-dependent signal we improve by

\sim 2

orders of magnitude on our previous limit obtained from the total rate of

1 e^{-}

events, using the same dataset. This daily modulation search represents the current strongest limit on DM-electron scattering via ultralight mediators for DM masses around

1 MeV / c^{2}

.

experimental results
dark matter: mass
photon: mediation
dark matter: flux
modulation
electron
dark matter: scattering
time dependence

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