Search for Low-Mass Dark Matter with CsI(Tl) Crystal Detectors
  We present a search for low-mass ($\leq 20 GeV/c^{2}$) 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 (KIMS) experiment. With a total data exposure of 24,324.3kg$\cdot$days,we search for WIMP interaction signals produced by nuclei recoiling from WIMP-nuclear elastic scattering with visible energies between 2 and 4keV. 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 rejects most of the low mass region of parameter space favored by the DAMA annual modulation signal. 
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,...
astro-ph.CO hep-ex physics.ins-det