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Limits on inelastic dark matter from ZEPLIN-III

Abstract : We present limits on the WIMP-nucleon cross section for inelastic dark matter derived from the 2008 run of ZEPLIN-III. Cuts, notably on scintillation pulse shape and scintillation-to-ionisation ratio, give a net exposure of 63 kg.days in the range 20-80keV nuclear recoil energy, in which 6 events are observed. Upper limits on signal rate are derived from the maximum empty patch in the data. Under standard halo assumptions a small region of parameter space consistent, at 99% CL, with causing the 1.17 ton.year DAMA modulation signal is allowed at 90% CL: it is in the mass range 45-60 GeV with a minimum CL of 88%, again derived from the maximum patch. This is the tightest constraint on that explanation of the DAMA result yet presented using a xenon target.
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Submitted on : Monday, June 4, 2012 - 3:26:31 PM
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D. Yu. Akimov, H. M. Araujo, E. J. Barnes, V. A. Belov, A. Bewick, et al.. Limits on inelastic dark matter from ZEPLIN-III. Physics Letters B, Elsevier, 2010, 692, pp.180-183. ⟨10.1016/j.physletb.2010.07.042⟩. ⟨in2p3-00703940⟩



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