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

  • H. S. Lee
  • , H. Bhang
  • , J. H. Choi
  • , S. Choi
  • , I. S. Hahn
  • , E. J. Jeon
  • , H. W. Joo
  • , W. G. Kang
  • , B. H. Kim
  • , G. B. Kim
  • , H. J. Kim
  • , J. H. Kim
  • , K. W. Kim
  • , S. C. Kim
  • , S. K. Kim
  • , Y. D. Kim
  • , Y. H. Kim
  • , J. H. Lee
  • , J. K. Lee
  • , S. J. Lee
  • D. S. Leonard, J. Li, J. Li, Y. J. Li, X. R. Li, S. S. Myung, S. L. Olsen, J. W. Park, I. S. Seong, J. H. So, Q. Yue

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

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.

Original languageEnglish
Article number052006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume90
Issue number5
DOIs
StatePublished - 23 Sep 2014

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