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Limits on inelastic dark matter from ZEPLIN-III
Preprint
D. Yu. Akimov ,
H. M. Araujo ,
E. J. Barnes ,
V. A. Belov ,
A. Bewick ,
A. A. Burenkov ,
R. Cashmore ,
V. Chepel ,
A. Currie ,
D. Davidge ,
J. Dawson ,
T. Durkin ,
B. Edwards ,
C. Ghag ,
A. Hollingsworth ,
M. Horn ,
A. S. Howard ,
A. J. Hughes ,
W. G. Jones ,
G. E. Kalmus ,
A. S. Kobyakin ,
A. G. Kovalenko ,
V. N. Lebedenko ,
A. Lindote ,
I. Liubarsky ,
M. I. Lopes ,
R. Luscher ,
K. Lyons ,
P. Majewski ,
A. StJ. Murphy ,
F. Neves ,
S. M. Paling ,
J. Pinto da Cunha ,
R. Preece ,
J. J. Quenby ,
L. Reichhart ,
P. R. Scovell ,
C. Silva ,
V. N. Solovov ,
N. J. T. Smith ,
P. F. Smith ,
V. N. Stekhanov ,
T. J. Sumner ,
C. Thorne ,
L. de Viveiros ,
R. J. Walker
2010-03-29
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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.