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The IceCube Neutrino ObservatoryThe IceCube Neutrino ObservatoryTo Explore the EHE UniverseTo Explore the EHE Universe
Shigeru YoshidaThe Chiba University
The Baseline Performance
Let me acknowledge you first
• MC data production/debugging
Juan Carlos, Keiichi, Mio, Paolo, Xianwu,….• Weighting/IC-9 analysis/Filtering
Aya, Carsten, Dusan• Offline software coordination
David B.• Atmospheric Muon modeling
Francis, Gary, Tom G., …• PMT saturation
Chris, Kotoyo, Mina
Many IceCubers !
Baseline search policy
As Simple and Robust as possiblebecause….
• Must be clear demonstration to everybody outside the IceCube collaboration• Need not to rely on detailed (uncertain) detector response (ex. ice propagation)
main signalGZK neutrino induced leptonsGZK neutrino induced leptons
background Atmospheric muonAtmospheric muon
Background in EHE search
Fluxes at the IceCube depth
IC9 Data
log10(in-ice muon energy [GeV])
log
10(N
pe
)
IC9 data regionSee Aya’s talk this afternoon
Energy - Npe
IC9
Full IceCube
log10(in-ice muon energy [GeV])
log
10(N
pe
)
log10(in-ice tau energy [GeV])
Energy – Npe (BG – Signal)
e + +
log
10(N
pe
)
log
10(N
pe
)
log10(in-ice energy [GeV]) log10(in-ice energy [GeV])
Baseline Event Rate
GZK Yoshida-Teshima
(m, Zmax) = (4,4)
0.70
GZK Klashev et al
(m, Zmax) = (3,5)
1.10
Top Down Sigl et al
SUSY
6.73
Atmospheric Muon(Elbert-IceCube9 extension)
~0.000187
Number of Events/365 day
Muon Bundle?Survived BG events
IC9 data suggested…
GeV103E 10CR
For 1000 x rate ~ 1/year
GeV106E 8CR
50 times MORE Energy must be channeled into !
%20E
E
CR
TeV
!?
Possible improvements
Toward more GZK event rate….
Better zenith angle reconstruction
x 1.1
With IceTop veto
x 1.3
cos(first-guessed )
log10(Npe)
Possible improvementsToward “background-free” event detection….
DOMs without photon signal
Distance [m]
log 1
0(N
umbe
r of
Ph
oto
elec
tron
)
Distance [m]
From the Mio’s talkin the cascade sessionAnd her TAUP2007 poster
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