Search for low-mass dark matter with CsI(Tl) crystal detectors

H. S. Lee et al. (KIMS Collaboration)
Phys. Rev. D 90, 052006 – Published 23 September 2014

Abstract

We present a search for low-mass (20GeV/c2) weakly interacting massive particles (WIMPs), strong candidates of dark matter particles, using the low-background CsI(Tl) detector array of the Korea Invisible Mass Search experiment. With a total data exposure of 24,524.3 kg days, we search for WIMP interaction signals produced by nuclei recoiling from WIMP-nuclear elastic scattering with visible energies between 2 and 4 keVee (electron-equivalent energy). The observed energy distribution of candidate events is consistent with null signals, and upper limits of the WIMP-proton spin-independent interaction are set with a 90% confidence level. The observed limit covers most of the low-mass region of parameter space favored by the DAMA annual modulation signal assuming the standard halo model.

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  • Received 21 July 2014

DOI:https://doi.org/10.1103/PhysRevD.90.052006

© 2014 American Physical Society

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Vol. 90, Iss. 5 — 1 September 2014

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