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IceCube EHE analysis Present Status and Future Plan

This presentation discusses the current status and future plans for the IceCube EHE analysis. It covers topics such as event selection, energy reconstruction, empirical models, and roadmap to analysis. The goal for 2007 is to publish the first results of the EHE search.

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IceCube EHE analysis Present Status and Future Plan

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  1. IceCube EHE analysisPresent Status and Future Plan Shigeru Yoshida For the EHE working group

  2. Preliminary Event Selection V01-07-04 (DC1) Atmospheric m GZK m GZK t

  3. Npe - Energy V01-07-04 (DC1)

  4. Npe - Energy V01-09-03 MCHits / DOM < 100000 FADC bins 50 ~ 1 usec

  5. 9-strings working data NDOM >80 NDOM >80 Npe>105 Npe>105 Npe>104 Npe>104

  6. 9-strings working data Needs statistics ! to understand Intensity(Npe, zenith), DOM response in EHE regime Npe>104 ~ 500 Events/yr

  7. Roadmap to analysis Energy Atmospheric m BG GZK m/t Signal Empirical Model Extrapolate to signal domain Tune Npe In-Ice data IceSim IceSim Tune Standard Candle 9-strings unblinded data Eff. Area Cos(zenith) Log(Npe) Cos(zenith) NDOM Energy Log(Npe) Log(Npe)

  8. N events in a file 1/22 of Available sample Samples used in slides Nch>50 sample Available level1 EHE Data

  9. 2. Corrected by 150 ns offset 3. Corrected random amplitude samples Waveforms…Problems 1. Samples at random

  10. FADC 50-6=44 bins (=1.1 microsecond) …. Too short!! Very difficult baseline estimation For FADC zero baseline is used in the following ATWD is of course far too short. For ATWD the ‘iteration method’ but not perfect, still

  11. MC – IC9 data comparison V01-07-04 (DC1) IC-9 data ~E-4 ~E-4

  12. MC – IC9 data comparison IC-9 data (Only 5% of total data sample) V01-09-01 (DC2)

  13. MC – IC9 data comparison IC-9 data (Only 5% of total data sample) V01-09-01 (DC2)

  14. 9-strings“EHE”REAL DATA Build Empirical Model Cos(zenith) IceSim Log(Npe) Muon bundles 1PeV bundle of 1000 muons (1TeV/muon) • Npe only wouldnotbe able to resolve tracks • We donotknow cosmic ray intensity in EHE • We donotknow cosmic ray composition in EHE • Corsika hasnotreconstructed AGASA/Auger data

  15. Roadmap to analysis November 2006 Energy Atmospheric m BG GZK m/t Signal Empirical Model Extrapolate to signal domain May 2007 December 2006 Tune Npe On-going In-Ice data IceSim IceSim Tune Standard Candle 9-strings unblinded data Eff. Area Cos(zenith) Log(Npe) Cos(zenith) NDOM Energy Log(Npe) Log(Npe)

  16. The EHE track reco : PDF 1017 eV 50 m 1 p.e. 100 m 200 m 300 m

  17. Energy Reconstruction! The EHE track reco Waveform Comparison Parameterized function MC data Profile (MC data) 100 PeV

  18. Sensitivity/Bound Quasi-differential method This is MODEL independent!! Bound: energy dependent!! S. Yoshida et. al. (2004) Phys. Rev. D 69 103004

  19. http://www.ppl.phys.chiba-u.jp/research/IceCube/EHE/ The Goal in 2007 • Publish the 1st results of EHE n search

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