SAC/PAP March 1, 2007Analysis plans IceCube analysis plans, Outline of presentation Initial emphasis...

SAC/PAPMarch 1, 2007 Analysis plans

IceCube analysis plans,Outline of presentation

• Initial emphasis on atmospheric neutrinos

• Use IceCube filter requests as guide to current activity

• Working group structure

• Publications– Initial technical and performance papers– Conference papers, including ICRC– Future plans


Atmospheric neutrinos

• As background– Especially important for “diffuse” search

• As calibration beam– Angular and energy dependence are well known up to

onset of prompt from charm– Both and e detectable in IceCube

• As physics beam– 104 to 105 per year (depending on low-energy cuts)– Search for hadro-production of charm– Limits on new physics

• Violations of Lorentz invariance• Non-standard oscillations• Neutriino cross sections, mini-BH production


Naïve expectation for atmospheric

• Assumptions:– Muon neutrinos:

Full efficiency for range > 0.5 km (En > 150 GeV)

– Electron neutrinos: Efficiency for e from PDD is 0 for E < TeV

• Note advantage of lowering Eth for e

Spectrum of e events per km3 yr (perfect eff)

Upgoing muon events2005 2006

9-string atmospheric

• First IceCube thesis, John Pretz, U Md

• Paper in preparation– 137 days live time

– 234 atmospheric events after (severe) cuts

– Compared to 225 +81 / -78 expected• 211 expected atmospheric ; 14 background

– Timing only, no use of wave-forms– No energy unfolding

Plots of atmospheric from draft atmospheric neutrino paper

IC-9 atmospheric analysisAzimuth Zenith

(180 = vertically up-going)

Structure in azimuth reflects asymmetry of 9-string detector

Disagreement at horizon reflects inadequately simulated background(e.g. two unrelated muons in window)Note low efficiency for horizontal because of severe cuts on bg

Simulatons in preparation for diffuse analysis of IC9 data

Optimize cuts for E-2 spectrum extending above steep atmospheric background

Simulations in preparation for diffuse analysis of IC9 data

IceTop/in-ice coincident eventsFor cosmic-ray physics, calibration& background tagging for IceCube


Filter proposals submitted to Trigger Filter Transmission (TFT) Board

– The Muon channel request. • Proposal on docushare • Contact: Kara Hoffman

<[email protected]> – Cascade filter

• Proposal on docushare • Contact: Pat Toale <[email protected]>

– Tau filter • Proposal on docushare • Contact: Seon-Hee Seo

<[email protected]> – Contained low energy cascade/muon filter

• Proposal on docushare • Contact: Steve Movit <[email protected]>

– Cosmic Ray physics filter / IceTop • Proposal on docushare • Contact: Tom Gaisser

<[email protected]> – WIMP filter

• Proposal on docushare • Contact: Gustav Wikstrom

<[email protected]> – Online Verification proposal

• Proposal on docushare • Contact: Carsten Rott <[email protected]

– Online DST propsal • Proposal on docushare • Contact: Paolo Desiati

<[email protected]>, Juan Carlos Diaz-Velez <[email protected]>, David Boersma <[email protected]>

– Exotics proposals • 2007_Online_Filters Exotics group filter

proposals wiki page. • Proposal from docushare • Contact: Brian Christy

<[email protected]> – EHE Filter proposal

• Proposal on docushare • Contact : Dusan Turcan <[email protected]>

– Moon shadow search proposal • Contact: David Boersma

<[email protected]> • Proposal on docushare • Additional background information at: Juande's

reconstruction comparison page – GRB Raw data proposal

• Proposal on docushare • Contact: Ignacio Taboada

<[email protected]>

Proposal to use GCN alerts to capture all data around GRB

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30043/TFT07_MuGroup_Upmu_filter.pdf

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30038/TFT07_cascade-filter-proposal.pdf

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30041/TFT07_HighE_tauFilter_2007.pdf

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30042/TFT07_low-e-cascademu-filter.pdf

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30039/TFT07_CosmicRayrequest.pdf

http://docushare.icecube.wisc.edu/docushare/dsweb/Get/Document-30045/TFT07_Wimp_WG_filter.pdf


Upward muon filter for atmospheric

• Need fast reconstruction algorithm for purpose of filtering


“Cascade” filter


Low energy cascade filter

Uses “contained” events to select low energy

Extends cascade sensitivity down to 100 GeV for atmospheric e

AMANDA string spacing ~30 m


Expected rate of “contained” e

By lowering threshold with sufficient efficiency, we could get 10s of e / yr


Moon filter

• No neutrino standard candle to verify absolute pointing and resolution

• Use shadow of the moon in downward cosmic-ray induced muons

• Expect per cent level depression

• Use 15 < < 29 degrees in 2007 (max gets smaller in later years)


Angular resolution for point sources of

(22 string)

Note: at 3 TeV r.m.s. deflection of wrt is ~ 1o


Angular resolution improves as detector grows


Shape of reconstruction

Fit with 2 Gaussians:

22 strings

Note peak of well-reconstructed events on broader distribution


Working group structure

• As envisioned in PDD– Atmospheric , IceTop– Atmospheric , WIMPs, oscillations– Astrophysical (diffuse & point sources, both

steady and bursts); relativistic monopoles– e, , NC, all sources– Supernova, variations of muon fluxes

• Working group structure developed significantly after actual work began:

Physics topic groupsPhysics topic groups

TauCascade Muon

Cosmic rays

Exotics

GRBs

Diffuse WIMPs EHE

Point sources

Atmospheric

Analysis Coordinator

Channel coordinatorsChannel coordinators


TauCascade Muon

Cosmic rays

Exotics

GRBs

Diffuse WIMPs EHE

Point sources

Atmospheric

Analysis Coordinator

Channel coordinatorsChannel coordinators

Physics

Cosmic raysCosmic rays

Atmospheric neutrinosAtmospheric neutrinos Point source neutrinosPoint source neutrinos Gamma-ray burstsGamma-ray bursts

WIMPsWIMPs Diffuse neutrinosDiffuse neutrinos

EHE neutrinos/muonsEHE neutrinos/muons

Exotic particlesExotic particles

Supernovae Supernovae

Searches for non-predicted Searches for non-predicted physicsphysics

Muon Muon Kara Hoffman, U MarylandKara Hoffman, U Maryland Cascade Cascade Spencer Klein, LBNLSpencer Klein, LBNL Hydrid and Tau channelHydrid and Tau channel Doug Cowen, PSUDoug Cowen, PSU


Detection channel coordinators:Detection channel coordinators:

Tom Gaisser, U. DelawareTom Gaisser, U. Delaware

Albrecht Karle, UW MadisonAlbrecht Karle, UW MadisonElisa Bernardini, DESY-ZeuthenElisa Bernardini, DESY-Zeuthen

Paolo Desiati, UW MadisonPaolo Desiati, UW Madison

Per Olof Hulth, StockholmPer Olof Hulth, Stockholm

Ignacio Taboada, UC BerkeleyIgnacio Taboada, UC Berkeley

Gary Hill, UW MadisonGary Hill, UW MadisonSpencer Klein, LBNLSpencer Klein, LBNL

David Hardtke, UC BerkeleyDavid Hardtke, UC Berkeley

Lutz Koepke, MainzLutz Koepke, Mainz

Shigeru Yoshida, ChibaShigeru Yoshida, Chiba

Analysis coordinator:Analysis coordinator:Gary Hill, UW MadisonGary Hill, UW Madison

IceCube analysis matrix – plansIceCube analysis matrix – plansCo

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Chiba - Yoshida EHEPSU - Cowen x tau x xClark Atlanta - Japaridze x xMainz - Koepke x x x xMons - Herquet xU Maryland - Sullivan x np x x x x xCanterbury - Adams x x rStockholm - Hulth x xU Delaware - Gaisser x x ga rVUB - Declercq x xULB - Bertrand x xWuppertal - Kampert x xDortmund - Rhode x x x x xSouthern - Fazeley osc x xLBNL - Klein/Stokstad hpt x x x x xDESY - Schlenstedt x x x x x x x aUtrecht - van Eijndhoven xOxford - Sarkar xKansas - Besson rUC Berkeley - Price x ga x x x aUC Irvine - Barwick x xUW Madison - Karle x x x x x x x x x x rUppsala - Botner/Hallgren x x x x aUW River Falls - MadsenxHumbolt - Kolanoski x x x xGent - Ryckbosch xHeidelberg - Resconi np x aAachen- Wiebusch le x x aAnchorage- Rawlins x x

February 2007February 2007


Publications

• IceCube first year performance paper

• Atmospheric neutrinos in IceCube– 9 string analysis– Plan for 22-string analysis and later

• IceCube technical papers

• Conference papers – ICRC as snapshot

• AMANDA papers


IceCube (inc. AMANDA) at ICRC2007

• Talks/posters by category– 3 overview: IceCube, IceTop, AMANDA in I3– 4 atmospheric neutrino– 4 diffuse (hard spectrum) neutrino search– 1 search for neutrinos from GRB– 10 point source search– 6 cascade analyses, calibration with flashers– 3 monopole search– 8 cosmic ray – 1 Radio detectors in IceCube


Proposed I3 papers for 2007

• Finish publications on AMANDA: several papers• Start IceCube-9

– Atmospheric with I3-9 is ready for Collaboration review

– Others listed on publication committee wiki:• Point source search with I3-9 • Search for EHE n with I3-9 • Limits on monopoles with I3-9

• Or wait for IC-22 with more uniform acceptance?


Extra slides:

Point source search exercise – can we find a pre-selected point source if signal exists at 5 sigma ?


Random atmospheric background

• First illustration of a “data challenge” style test • Point source search with maximum likelihood method,

IC-9• Background skymap - 288 Atmospheric Neutrino

Events, simulated


Add 9 source events• Add E-2 source events according to Poisson distribution of

mean <n>=8.6. In this case, 9 source events added to the data set (RA=0, Dec=40), analyzed same as background :


Events found with expected significance

• Add E-2 source events according to Poisson distribution of mean <n>=8.6. In this case, 9 source events added to the data set (RA=0, Dec=40), analyzed same as background:

• Perform Max. Like. analysis looking for source at this location. Find:– Estimated number of source events: nest = 8.1

– Chance probability: 310-7 (median expected for <n>=8.6 is 510-7)

SAC/PAP March 1, 2007Analysis plans IceCube analysis plans, Outline of presentation Initial emphasis...

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