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Limits on WIMP-nucleon interactions with CsI(Tl) crystal detectors

H. S. Lee, H. C. Bhang, J. H. Choi, H. Dao, I. S. Hahn, M. J. Hwang, S. W. Jung, W. G. Kang, D. W. Kim, H. J. Kim, S. C. Kim, S. K. Kim, Y. D. Kim, J. W. Kwak, Y. J. Kwon, J. Lee, J. H. Lee, J. I. Lee, M. J. Lee, S. J. Lee, J. Li, X. Li, Y. J. Li, S. S. Myung, S. Ryu, J. H. So, Q. Yue, J. J. Zhu

Abstract

The Korea Invisible Mass Search(KIMS) experiment presents new limits on WIMP-nucleon cross section using the data from an exposure of 3409 kgd taken with low background CsI(Tl) crystals at Yangyang underground laboratory. The most stringent limit on the spin dependent interaction for pure proton case is obtained. The DAMA signal region for both spin independent and spin dependent interactions for the WIMP mass higher than 20 GeV/c^2are excluded by the single experiment with crystal scintillators.

Limits on WIMP-nucleon interactions with CsI(Tl) crystal detectors

Abstract

The Korea Invisible Mass Search(KIMS) experiment presents new limits on WIMP-nucleon cross section using the data from an exposure of 3409 kgd taken with low background CsI(Tl) crystals at Yangyang underground laboratory. The most stringent limit on the spin dependent interaction for pure proton case is obtained. The DAMA signal region for both spin independent and spin dependent interactions for the WIMP mass higher than 20 GeV/c^2are excluded by the single experiment with crystal scintillators.

Paper Structure

This paper contains 6 equations, 6 figures, 2 tables.

Figures (6)

  • Figure 1: (color online). $MT$ distribution of NR events (open squares), ER events (open circles) and WIMP search data (filled triangles) of S0501A crystal in the 5-6 keV range. Fitted PDF functions are overlayed. $\chi^2/DOF=$0.8 and 1.3 with $DOF$=38 and 35 for NR and ER events respectively.
  • Figure 2: (color online). Extracted NR event rates of the S0501A (open circles), S0501B (filled circles), B0510A (filled squares), and B05010B (filled triangles) crystals and only statistical errors (1$\sigma$) are shown. The points are shifted with respect to each other on the $x$-axis to avoid overlapping.
  • Figure 3: (color online). Exclusion plot for the SD interaction in the case of pure proton coupling ($a_n=0$) at the 90% confidence level
  • Figure 4: (color online). Exclusion plot for for the SD interaction in the case of pure neutron coupling ($a_p=0$) at the 90% confidence level
  • Figure 5: (color online). Allowed region (90% confidence level) in $a_p - a_n$ plane by KIMS data (inside the solid line contour) for 50 GeV WIMP mass. Results of CDMS akerib06(dotted line) and NAIAD naiad05(dot-dashed line) are also shown.
  • ...and 1 more figures