Limits on inelastic dark matter from ZEPLIN-III
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
We present limits on the WIMP–nucleon cross section for inelastic dark matter from a reanalysis of the
2008 run of ZEPLIN-III. Cuts, notably on scintillation pulse shape and scintillation-to-ionisation ratio, give
a net exposure of 63 kg day in the range 20–80 keV 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 yr DAMA
modulation signal is allowed at 90% CL: it is in the mass range 45–60 GeVc−2 with a minimum CL
of 87%, again derived from the maximum patch. This is the tightest constraint yet presented using xenon,
a target nucleus whose similarity to iodine mitigiates systematic error from the assumed halo.
2008 run of ZEPLIN-III. Cuts, notably on scintillation pulse shape and scintillation-to-ionisation ratio, give
a net exposure of 63 kg day in the range 20–80 keV 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 yr DAMA
modulation signal is allowed at 90% CL: it is in the mass range 45–60 GeVc−2 with a minimum CL
of 87%, again derived from the maximum patch. This is the tightest constraint yet presented using xenon,
a target nucleus whose similarity to iodine mitigiates systematic error from the assumed halo.
Date Issued
2010-08-30
Date Acceptance
2010-07-21
Citation
Physics Letters B, 2010, 692 (3), pp.180-183
ISSN
0370-2693
Publisher
Elsevier: SCOAP3
Start Page
180
End Page
183
Journal / Book Title
Physics Letters B
Volume
692
Issue
3
Copyright Statement
© 2010 Elsevier B.V. Open access under CC BY license.
License URL
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
Physics
PHYSICS, MULTIDISCIPLINARY
Inelastic dark matter
WIMPs
Xenon
NAI(TL)
DETECTOR
DAMA/LIBRA
SEARCH
Publication Status
Published