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Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg?d Target Exposure of DAMIC at SNOLAB

Abstract: We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg?d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200??eVee in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50??eVee. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections ???n as low as 3×10?41??cm2 for WIMPs with masses m? from 7 to 10??GeV?c?2. These results are the strongest constraints from a silicon target on the existence of WIMPs with m?<9??GeV?c?2 and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phys. Rev. Lett. 125, 241803 (2020)

Editorial: American Physical Society

 Fecha de publicación: 01/12/2020

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.125.241803

ISSN: 0031-9007,1079-7114

Url de la publicación: https://doi.org/10.1103/PhysRevLett.125.241803

Autores/as

AGUILAR ARÉVALO, A.

AMIDEI, D.

CANCELO, G.

CERVANTES VERGARA, B. A.

CHAVARRÍA, A. E.

MARIA AMPARO LOPEZ VIRTO