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Can WIMP Spin Dependent Couplings explain DAMA? Limits from DAMA and Other Experiments. Christopher M. Savage University of Michigan – Ann Arbor. Katie Freese (University of Michigan) Paolo Gondolo (University of Utah) astro-ph/0408346 to appear in Phys. Rev. D. Overview.

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Can wimp spin dependent couplings explain dama limits from dama and other experiments

Can WIMP Spin Dependent Couplings explain DAMA?Limits from DAMA and Other Experiments

Christopher M. Savage

University of Michigan – Ann Arbor

Katie Freese (University of Michigan)

Paolo Gondolo (University of Utah)

astro-ph/0408346

to appear in Phys. Rev. D

KICP - Spin Dependent Limits


Overview
Overview

  • DAMA/NaI positive signal and CDMS II null result are not compatible for spin-independent couplings (assuming the standard halo model)

    With exceptions – Gelmini & Gondolo (2004)

  • WIMPs may alternatively have spin-dependent couplings; examine if this case has parameter space consistent with the DAMA signal and the null results of other experiments

    P. Ullio, M. Kamionkowski, and P. Vogel,JHEP 0107, 044 (2001).

    F. Giuliani, arXiv:hep-ph/0404010.

KICP - Spin Dependent Limits


Direct detection

Detector

WIMP

Scatter

WIMP

Direct Detection

Goodman &Witten (1985)

  • Elastic scattering of WIMP off detector nuclei

  • Rate:

  • Recoils:

  • Efficiencies, quenching, multiple elements

  • CDMS, CRESST, Edelweiss,SIMPLE, ZEPLIN, NAIAD, etc.

KICP - Spin Dependent Limits


Annual modulation

WIMP Halo Wind

30 km/s

232 km/s

Annual Modulation

Drukier, Freese & Spergel (1986)

  • Earth’s motion

    • With disk (June)Against disk (December)

  • Modulation Amplitude:

  • DAMA (R. Bernabei et al., 2003)

    Nma = 0.0200 ± 0.0032 /kg/day/keVee (2-6 keVee)

  • Elegant V, etc.

KICP - Spin Dependent Limits


Indirect detection

n

WIMP

Indirect Detection

Silk, Olive & Srednicki (1985)

Freese (1986)

  • Gravitational capture Annihilation

  • Neutrino-induced muons

  • Sun: WIMP-proton cross-section

  • Baksan, Super-K, ANTARES, etc.

  • WIMP  anti-WIMP, asymmetry

  • Halo model dependence

KICP - Spin Dependent Limits


Spin dependent cross section
Spin-Dependent Cross-Section

  • Nuclear structure functions

    • Odd proton: Spp >> Snn

    • Odd neutron: Snn >> Spp

  • Finite momentum transfer

    • q = 0  SD  (ap + an)2  (<Sp>ap + <Sn>an)2

    • q  0: larger masses

KICP - Spin Dependent Limits


Spin dependent limits

Multiple Elements

EOGM

OGM

q  0

Spin-Dependent Limits

  • Null Result:

  • Positive Signal:

  • A, B, C

    • Depend on detector parameters,WIMP mass

    • Relative magnitude dependent uponSpp, Spn, Snn

  • Conics

    • Parallel lines

    • Ellipse

KICP - Spin Dependent Limits


Spin dependent limits1
Spin-Dependent Limits

  • Proton only coupling (an = 0)

  • Neutron only coupling (ap = 0)

  • General couplings

KICP - Spin Dependent Limits


Wimp proton cross section limits for a n 0
WIMP-Proton Cross-Section Limits(for an = 0)

NAIAD, etc.

KICP - Spin Dependent Limits


Wimp neutron cross section limits for a p 0

ap = -3

Zeplin I (Preliminary)

V. Kudryavtsev et al., IDM 2004

WIMP-Neutron Cross-Section Limits(for ap = 0)

KICP - Spin Dependent Limits


Allowed couplings
Allowed Couplings

KICP - Spin Dependent Limits


Allowed couplings low mass
Allowed Couplings (Low Mass)

KICP - Spin Dependent Limits


Results
Results

  • WIMP masses of 5-13 GeV:

    • Parameter spaces still remain which are compatible with DAMA signal and all null results

    • Allows for comparable proton and neutron couplings

      (e.g. ap = an = 2.5 at 8 GeV)

    • All solutions have

    • No MSSM candidates

      • LEP: M > 30 GeV (Abbiendi et al. [OPAL], 2000)

KICP - Spin Dependent Limits


Results 12 8
Results (12/8)

  • WIMP masses of 5-10 GeV:

    Super-K extended analysis

S. Desai for Super-K

(private correspondence)

KICP - Spin Dependent Limits


Conclusions
Conclusions

  • DAMA can still be explained by a WIMP with spin-dependent couplings, although at masses too low for MSSM.

  • Extending analysis of Super-K (Baksan) results to lower masses could confirm or rule out the remaining spin-dependent parameter space for DAMA (for standard halo) – (IN PROGRESS). Odd-Z experiments (CRESST I, SIMPLE/PICASSO, COUPP,etc.) will also be able to examine this remaining space.

  • Thresholds more important than exposure

KICP - Spin Dependent Limits


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