High Energy VerificationStatus and plan for PY2005-2006

Shigeru Yoshida (Chiba University)

UHE/EHE in IceCube

Energy Range (10PeV – 10 EeV)“Signal” : GZK, Topdown

“BG” : Atmospheric and bundles

Detection Channel : / track with bunch of “cascades”

A Primary Study….

Looks encouraging!

Down-going events dominate…

1400 m

2800 m

11000mUp Down

Atmospheric is strongly attenuated…

S.Yoshida, R.Ishibashi, H.Miyamoto, PRD 69 103004 (2004)

Calculated by JULIeT

GZK in energy-direction plane GZK GZK Atmospheric

High E

Low E

Calculated by JULIeT

Events in Energy-direction plane

By Monte CarloGZK domain

Atm domain

IceCube EHE Sensitivity

S.Yoshida, R.Ishibashi, H.Miyamoto, PRD 69 103004 (2004)

90% C.L. for 10 year observation

Verification : questions to answer

# of PE, DOM hits work as a first filter?Can we estimate energy deposit?Energy – sec() plane really works?Is the “partial” IceCube array capable?

Who ?

Aya, Kotoyo, Sean, Albrecht (UW-Madison)Hiroko, Keiichi, Shigeru (Chiba)

Paolo (UW-Madison) - MC productionDavid (UW-Madison) – Reco softwareGary (UW-Madison) - Likelihood

“Advisor”

More welcome!

Offline software

Modules in IceTray

Numerical Calculation by JULIeT

Juliet-interface Propagator/Generator

PSI_PhotonicsLiteCherenkov

Hit-constructor etc

Weighting-moduleWeigher/CheckerFirst analyzer

Reco modules (wf-llh etc)Reconstruction

Juliet-interface Kotoyo (UW-Madison), Keiichi, Shigeru (Chiba)

Weighting -module Aya (UW-Madison)

I3WeigherModuleJulietMCWeightDict()

• PowerLawIndex•JulietDifferentialFlux•JulietPropagationMatrixNeutrinoFlux (GZK)•JulietPropagationMatrixAtmMuonFlux (). . . . I3WeigherCheckerJuliet

TTree

MCEvent

RecoEvent

Primary Cascade Track

WeightI3MCPrimary I3MCTrackI3MCCascade

Npe, NhitDOM, ..

MC data quick analysis Aya (UW-Madison), Keiichi (Chiba)

By I3WeigherCheckerJuliet

Log(Energy [GeV])Log(Energy [GeV])

# of

DO

Ms

Log(M

ax.

Casc

ade E

[G

eV

])

1 PeV Deposit

Energy loss profile in UHE/EHE

Stochastic LossInitiating high energyCascades!

By JULIeT

Cascade Reco Sean (UW-Madison)

By wf-llh-reco

Log(Energy)/ Log(Energy)

# of

Even

ts

1 PeV- 1000 PeV

e

NnNnP

Nn

k

i i

i

ii

i

!!!}){|}({

1

Likelihood of waveform(Gary UW-Madison)

To Do in near termMC data check and debuggingSimple filter for High Energy eventsComplete Weighter-module (flux, interaction-weight)“Effective Area” estimation based on simple variables (Npe, cos(zenith) etc)Bright cascade reco – PDF by PhotonicsComposite cascades = EHE track recoGet Ready for analysis data from 10++ strings

After the 10++ String deployment

Filtering “high energy” dataComparison with simulation data

(Note: mostly UHE atmospheric ) Npe, Multiplicity, Waveform, cos(zenith), “Energy”,

Verify a method to distinguish signal (GZK ) from background (Atm )

“ Standard Candle” (N2 laser) ~10PeV

“High energy” verification organization

The “gateway” websitehttp://www.ppl.phys.chiba-u.jp/research/IceCube/EHE/

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