Search for Dark Matter
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Transcript of Search for Dark Matter
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Search for Dark Matter
physics 805fall 2008
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WIMP search strategies
• Direct detection• Indirect detection:
– neutrinos from the Earth/Sun– antiprotons from the galactic halo– positrons from the galactic halo– gamma rays from the galactic halo– gamma rays from external galaxies/halos– synchrotron radiation from the galactic center /
galaxy clusters– ...
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• Search for an annual modulation due to the Earth’s motion around the Sun
direct detection - general principles
• WIMP + nucleus WIMP + nucleus
• Measure the nuclear recoil energy
• Suppress backgrounds
December June
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present limits
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DAMA result (> 8 sigma)
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WIMP Capture and Annihilation
DETECTOR
n
+ W + W +
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Inner Core Detector
Inner Core(same regionas AMANDA)
7 IceCube + 18 AMANDA strings
225 DOMs + 540 OMs
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neutralino capture and annihilation
sun
Freese, ’86; Krauss, Srednicki &Wilczek, ’86 Gaisser, Steigman & Tilav, ’86
velocitydistribution
scatt
capture
annihilation
interactions
int. int.
cc ,bb , tt , ,W, Z 0, HH 0
qq ll
W, Z,HSilk, Olive and Srednicki, ’85Gaisser, Steigman & Tilav, ’86
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indirect detection for cyclists
e.g. 101044 m m22 -telescope searches for 500 GeV WIMP
> LHC limit1. - flux 300 km/s
2. solar cross section
12
Z
4 scm]mGeV500[10x4.2v
3
Z
43 cm]mGeV500[10x8GeVcm4.0
]cm10][10x2.1[
mMn
24157
pp
sunpsun
2Z
2F
mM22
pF
MG~
)mG( 4H
2Z
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Nsun = capture rate = annihilation rate
_ WW
250 GeV250 GeV500 GeV
3. Capture rate by the sun
4. Number of muon-neutrinos
120sunsun s10x3N
sunN1.0x2N
is the leptonic branching ratio
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5.5 x 1023 cm-3
104 m2
~~__
# events = 10 per year
1282 scm10x2
d4N
Rtimeareaevents ice
)E21E(m625)GeV(Em5R
cm10x5.2)GeV(Ecm10 236238
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Disfavored by direct search (CDMS II)
Limits on muon flux from Earth Limits on muon flux from Sun
WIMP search
PRELIMINARY
1km3 (IceCube)
AMANDA 180d
Antares 3 yearsSK
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IceCube 22 strings
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Status indirect search
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DirectDetection
(Zeppelin4/Genius)
Black: outGreen: yes
Blue: no
IceCubevs
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