GZK EHEn detection

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GZK EHEn detection
TAUP 2003

• What is the GZK mechanism?
• EHE n/m/t Propagation in the Earth
• Expected intensities at the IceCube depth
• Atmospheric m background
• Event rate

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GZK Neutrino Production
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Note The oscillations convert ne, nm to ne,nm, nt
Yoshida and Teshima 1993 Yoshida, Dai, Jui,
Sommers 1997
TAUP 2003
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t/m propagation in Earth
TAUP 2003
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Products
ne
nm
nt
m
t
p
e/g
ne
Weak
Weak
nm
Weak
Weak
nt
Weak
Weak
Incoming
e/g
Cascades
Decay
Decay Weak
Pair/decay Bremss
m
Pair
Pair
PhotoNucl.
DecayPair
Pair Bremss Decay
Decay
Decay Weak
t
PhotoNucl.
Pair
p
Cascades
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Tau(Neutrinos) from nm nt
Muon(Neutrinos) from nm nt
Nadir Angle
TAUP 2003
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1.4km
1km
Ice
?
?
lepton
1km
Rock
?
Upward
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Upward-going
Downward going!!
TAUP 2003
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Down-going events dominates
Atmospheric m is strongly attenuated
Up
Down
TAUP 2003
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Flux as a function of energy deposit in km3

• dE/dXbE DEDXbE

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Up
Down
TAUP 2003
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Intensity of EHE m and t
cm-2 sec-1
GZK m4 Zmax4 Im(Egt10PeV) It(Egt10PeV) RATE /yr/km2
Down 5.90 10-19 5.97 10-19 0.37
Up 3.91 10-20 6.63 10-20 0.03
Im(Egt10PeV) Energy Deposit It(Egt10PeV) Energy Deposit
Down 4.75 10-19 2.94 10-19 0.24
m7 Zmax5Down 7.21 10-17 4.83 10-17 37.9
Atm m 1.74 10-19 0.05
TAUP 2003
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How EHE events look like
The typical light cylinder generated by a muon of
100 GeV is 20 m, 1PeV 400 m, 1EeV it is about
600 to 700 m.
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Conclusion
TAUP 2003
IceCube has great capability for
TeV-PeV n-induced muons taking advantage of long
range in the clear ice.
For EHE n like the GZK.
GZK n is DETECTABLE by IceCube 0.2-40
events/year (BG 0.05 events/year)