@article{10902/32444,
year = {2024},
month = {3},
url = {https://hdl.handle.net/10902/32444},
abstract = {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 ½0.53; 2.7 MeV=c2 interacting with electrons via a dark photon mediator. Taking advantage of
the time-dependent signal we improve by ∼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=c².},
organization = {I. F. C. A. was supported by Project No. PID2019–109829 GB-I00 funded by MCIN/AEI/10.13039/501100011033. B. J. K. acknowledges funding from the Ramón y Cajal Grant No. RYC2021-034757-I, financed by MCIN/AEI/10.13039/501100011033 and by the European Union “NextGenerationEU”/PRTR.},
publisher = {American Physical Society},
publisher = {Physical Review Letters, 2024, 132(10), 101006},
title = {Search for daily modulation of MeV dark matter signals with DAMIC-M},
author = {Arnquist, I. and Avalos, N. and Baxter, D. and Bertou, X. and Castelló Mor, Nuria and Chavarria, A.E. and Cuevas Zepeda, J. and Dastgheibi-Fard, A. and De Dominicis, C. and Deligny, O. and Duarte Campderros, Jorge and Estrada, E. and Gadola, N. and Gaïor, R. and Hossbach, T. and Iddir, L. and Kavanagh, Bradley James and Lantero Barreda, Agustín and López Virto, María Amparo and Vilar Cortabitarte, Rocío},
}