GZK EHE detection What is the GZK mechanism? EHE Propagation in the Earth Expected intensities at...
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Transcript of GZK EHE detection What is the GZK mechanism? EHE Propagation in the Earth Expected intensities at...
GZK EHE detection
What is the GZK mechanism?
EHE Propagation in the Earth
Expected intensities at the IceCube depth
Atmospheric – background
Event rate
TAUP 2003
GZK Neutrino ProductionGZK Neutrino Production
2.725 K
411 photons / cm3
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
0.6 x 10-27 cm2
γp
n p
π+ μ+ ν
e+
νγ
E = 10 20 eV
E 0.8 x 10 20 eV ~
Conventional Mechanism of EHE neutrinos!!Conventional Mechanism of EHE neutrinos!!
TAUP 2003
Yoshida and Teshima 1993Yoshida, Dai, Jui, Sommers 1997
Note: The oscillations convert e, to e,,
e
e
e/
e/
Weak
Weak
Weak
Inco
min
gProducts
Weak
Weak
Weak
Cascades
Cascades
Decay DecayWeak
Pair/decayBremss Pair Pair PhotoNucl.
PhotoNucl.DecayPair Pair
PairBremssDecay
DecayWeak
Decay
TAUP 2003
Down-going events dominates…
1400 m
2800 m
11000mUp Down
Atmospheric is strongly attenuated…
TAUP 2003
Intensity of EHE and GZK m=4 Zmax=4
I(E>10PeV) I(E>10PeV) 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
I(E>10PeV) Energy Deposit
I(E>10PeV) Energy Deposit
Down 4.75 10-19 2.94 10-19 0.24
m=7 Zmax=5Down
7.21 10-17 4.83 10-17 37.9
Atm 1.74 10-19 0.05
[cm-2 sec-1]
Eµ=10 TeV ≈ 90 hits Eµ=6 PeV ≈ 1000 hits
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.
TAUP 2003Conclusion
appeared in 10 PeV- EeV are our prime target on GZK detection.
1/100-1/500 of primary intensity!Downward and make main contributions in PeV -EeV
Energy Estimation would be a key for the bg reductionBecause atmospheric spectrum ~ E-3.7
GZK is DETECTABLE by IceCube 0.2-40 events/year (BG 0.05 events/year)
IceCube has great capability for TeV-PeV-induced muons taking advantage of long rangein the clear ice.
For EHE like the GZK….