1. KIMS & Inelastic DarK Matter(iDM)
S.C.Kim
(SNU)
Korea china workshop 2011

2. Dark matter search Which is right?
Claiming the observation of DM annual modulation
Null observation
of DM
Which is right?

3. How to reconcile all the experiments?
Many ideas have been suggested such as mirror DM, dipolar DM, hidden charged DM, composite DM, electron interacting DM, resonant DM, inelastic DM or Frankenstein DM that patches up the features of several DM models (from Resonannces Blog)

4. Inelastic dark matter(iDM)
Proposed to reconcile the DAMA observation of WIMP
and other null observation experiments
an excited state * of the dark matter particle
with a mass m* - m =  ~ 100keV .
=> Typical kinetic energy of DM
 N -> * N (inelastic scattering)
rather than  N ->  N (elastic scattering)

5. Minimum velocity for recoil Energy, ER
mN : mass of target Nucleus
µ:reduced mass of WIMP & target Nucleus
:mass splitting between  and*
min ER

6. Three key features *Spectrum of events is dramatically changed,
suppressing or eliminating low-energy events.
->Spectrum of Conventional WIMP rises exponentially
at low energy.
But iDM peaks at ER ~20keV or above. ER
rate
Conventional WIMP spectrum
iDM spectrum
20keV

7. Three key features *Heavier targets favored over lighter targets.
For a given ER and ,
Heavier target mass -> lower min
-> greater available range of
velocity
Iodine(DAMA) is better than Germanium(CDMS).

8. Three key features f(v)
*modulation of the signal enhanced significantly.
Mainly high velocity WIMPs are detectible.
In these high velocity region, WIMP numbers is
changing rapidly.
Modulation ratio of DAMA/LIBRA according to 
f(v)
visible to DAMA
visible
to DAMA
and CDMS
Neal Weiner, NYU; IDM 2008

9. Expected energy spectrum
Vesc
MN : mass of target Nucleus
µ:reduced mass of WIMP/target Nucleus
M : mass of WIMP
 : 0.3GeV/cm3
Astronomical parameters
f(v) ~ usually Maxwell-Boltzmann distribution assumed
Vesc = 500 – 600 km/s
=> 650 km/s (most widely used value)
=> 544 km/s (MNRAS 379(2007) p755)
Velocity dispersion(V0) = 220km/s
Vearth = Vsun + Vmodulation

10. Velocity profiles for WIMP
What is the true distribution around Vesc ?
There’s long debate about it.
J. Wacker
Aspen Winter 2011

11. iDM candidate? Fourth generation neutrino, Higgsino, Sneutrino may
be the iDM.
Inelasticity seems natural.
But,  ~ M v2(kinetic energy of WIMP) must be
explained.
Too sensitive to the astronomical parameters!

12. Constraints on iDM from the experiments
arXiv: (XENON 100)
iDM ruled out?

13. New version of iDM model Version 1 (PRL 106, 011301(2011))
Scattering off Thallium, not Iodine ?
(Tl, A(205)) (I, A(127))
Tl exists at level in DAMA NaI(Tl) detector.

14. New version of iDM model Version 2 (PRD 82, 125011(2010))
Magnetic inelastic dark matter ?
inelasticity <= large mass of Iodine
magnetic interaction <= large magnetic moment of Iodine

15. KIMS & iDM
the detector of KIMS CsI(Tl) Cs (large magnetic moment & large mass) + I ( the target element of DAMA, large magnetic moment & large mass) + Tl large mass) Whole iDM model can be tested with one experiment!

16. The Energy spectrum
for the Nuclear recoil events from KIMS
=> Determined from PSD analysis
90 % C.L limit
There’s no meaningful excess of NR signals !!!

17. The Energy spectrum
for the Nuclear recoil events from KIMS
The annual modulation amplitude from DAMA
At 2-4keV, ± counts/day/kg/keV
At the corresponding energy range ( keV)
in KIMS, (QF for DAMA =0.08 adopted)
The 90 % C.L limit is counts/day/kg/keV
This is well below the DAMA modulation amplitude.
Any scenario with Iodine for DAMA is not consistent
with KIMS results !!!

18. For thallium recoil scenario,
The corresponding energy range for Tl is almost same with I.
So, thallium scenario
is not likely either.

19. DAMA & KIMS in iDM model For WIMP velcocity profile,
SHM truncation adopted

20. Summary
iDM model has been proposed to reconcile the DAMA & other null results. As some experiments exclude the room for iDM model, new versions of iDM model was suggested. We show that the original and new versions of iDM scenario for DAMA are not consistent with new results of KIMS.