Propagation of UHE n in Earth

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Propagation of UHE n in Earth
Laguna Beach 2003

• Interactions
• First Results
• Implications for the IceCube
• Future Plan
• Shigeru Yoshida
• Dept. of Physics
• 
  CHIBA Univ.

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UHE (EeV or even higher) Neutrino Events
Arriving Extremely Horizontally

• Needs Detailed Estimation
• Limited Solid Angle Window

(srNA)-1 600 (s/10-32cm2) -1(r/2.6g cm-3) -1
km
Involving the interactions generating
electromagnetic/hadron cascades
mN
mX ee-
Laguna Beach 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 Weak
t
PhotoNucl.
Pair
p
Cascades
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Cross Sections and the Energy Loss Term
Laguna Beach 2003
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Muon-Neutrinos from nm nt
Nadir Angle
Laguna Beach 2003
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Tau-Neutrinos from nm nt
nt
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Tau Appearance
nt
nt
Laguna Beach 2003
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Downward going!!
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Upward-going
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Findings
m in PeV is enhanced due to the heavy lepton
Production.
Downward nt enhanced by the regeneration
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We still need
Laguna Beach 2003