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The IceCube Neutrino Observa The IceCube Neutrino Observa tory tory To Explore the EHE Universe To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance
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The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Dec 19, 2015

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Page 1: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

The IceCube Neutrino ObservatoryThe IceCube Neutrino ObservatoryTo Explore the EHE UniverseTo Explore the EHE Universe

Shigeru YoshidaThe Chiba University

The Baseline Performance

Page 2: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The 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 !

Page 3: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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)

Page 4: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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

Page 5: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Energy - Npe

IC9

Full IceCube

log10(in-ice muon energy [GeV])

log

10(N

pe

)

log10(in-ice tau energy [GeV])

Page 6: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Energy – Npe (BG – Signal)

e + +

log

10(N

pe

)

log

10(N

pe

)

log10(in-ice energy [GeV]) log10(in-ice energy [GeV])

Page 7: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe – Zenith Angle

e + +

log10(Npe) log10(Npe)

cos(first-guessed )

Page 8: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe & Zenith Angle

cos(first-guessed )log10(Npe)

Page 9: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe & Zenith Angle

cos(first-guessed )log10(Npe)

Page 10: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe – Zenith Cut

log10(Npe) log10(Npe)

cos(first-guessed ) cos(first-guessed )

Page 11: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe & Zenith Angle

cos(first-guessed )log10(Npe)

Page 12: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Npe & Zenith Angle

cos(first-guessed )log10(Npe)

Page 13: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Effective Area

Page 14: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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

Page 15: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Model-independent Sensitivity90 % C.L. based on dN/dLogE

srsecGeV/cm10x4E 282 @ 109 GeV

Page 16: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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

!?

Page 17: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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)

Page 18: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

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

Page 19: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

ConclusionGZK physics is doable with IceCube

events

Page 20: The IceCube Neutrino Observatory To Explore the EHE Universe Shigeru Yoshida The Chiba University The Baseline Performance.

Robustness against the ice model

(Bulk Ice)

(L

ayer

ed I

ce)