1. 2015/6/281 IceCube EHE analysis Present Status and Future Plan Shigeru Yoshida For the EHE working group

2. 2015/6/282 DOM response to high NPEs Log 10 ( ATWD estimated NPE ) Estimated number of photo-electrons per DOM ATWD or FADC? Log 10 (FADC based estimated NPE ) Log 10 (ATWD based estimated NPE ) Log 10 ( FADC estimated NPE) Log 10 (MC Truth NPE ) Red: DOM of which ATWD charge is larger Blue: DOM FADC is larger Npe saturation “ EHE specific ” response!

3. 2015/6/283 DOM response to high NPEs Log 10 ( ATWD estimated NPE ) Log 10 (FADC based estimated NPE ) Log 10 ( FADC estimated NPE) Log 10 (MC Truth NPE ) Red: DOM of which ATWD charge is larger Blue: DOM FADC is larger Npe saturation Log 10 (MC Truth NPE ) Log 10 (ATWD based estimated NPE ) Log 10 ( Best estimated NPE) V01-09-01

4. 2015/6/284 DOM response to high NPEs Log 10 ( ATWD estimated NPE ) Log 10 (FADC based estimated NPE ) Log 10 ( FADC estimated NPE) Log 10 (MC Truth NPE ) Red: DOM of which ATWD charge is larger Blue: DOM FADC is larger Npe saturation Log 10 (MC Truth NPE ) Log 10 (ATWD based estimated NPE ) Log 10 ( Best estimated NPE) V01-09-03

5. 2015/6/285 FADC Waveform characteristics V01-09-01 Log 10 ( FADC estimated NPE) ( FADC amplitude) FADC amplitude FADC baseline

6. 2015/6/286 FADC Waveform characteristics V01-09-03 Log 10 ( FADC estimated NPE) ( FADC amplitude) FADC amplitude FADC baseline

7. 2015/6/287 FADC-ATWD correlation V01-09-01

8. 2015/6/288 FADC-ATWD correlation V01-09-03

9. 2015/6/289 BUGGY ATWD !! V01-09-03 ( FADC amplitude) Red: ATWD amplitude Blue: FADC amplitude

10. 2015/6/2810 Upps !! V01-09-03 Red: ATWD waveform Blue: FADC waveform

11. 2015/6/2811 Preliminary Event Selection GZK  Atmospheric  GZK  V01-07-04 (DC1)

12. 2015/6/2812 Npe - Energy V01-07-04 (DC1)

13. 2015/6/2813 Npe - Energy V01-09-01 MCHits / DOM < 10000

14. 2015/6/2814 Npe - Energy V01-09-03 MCHits / DOM < 50000 FADC bins 50 ~ 1 usec

15. 2015/6/2815 Npe - Energy V01-09-03 MCHits / DOM < 100000 FADC bins 50 ~ 1 usec

16. 2015/6/2816 Preliminary Event Selection GZK  Atmospheric  GZK  V01-09-03 MCHits/DOM < 10000

17. 2015/6/2817 Event Rate V01-09-01 MCHits/DOM < 10000

18. 2015/6/2818 9-strings working data N pe >10 4 N DOM >80 N pe >10 5

19. 2015/6/2819 9-strings working data N pe >10 4 ~ 500 Events/yr Needs statistics ! to understand Intensity(N pe, zenith), DOM response in EHE regime

20. 2015/6/2820 GZK  Signal Roadmap to analysis Atmospheric  BG Standard Candle In-Ice data 9-strings unblinded data Energy Npe Log(Npe) N DOM Cos(zenith) Log(Npe) Cos(zenith) Log(Npe) IceSim Tune Energy Eff. Area Extrapolate to signal domain Empirical Model Tune

21. 2015/6/2821 Available level1 EHE Data N events in a file Samples used in slides 1/22 of Available sample Nch>50 sample

22. 2015/6/2822 Waveforms … Problems 1. Samples at random 2. Corrected by 150 ns offset 3. Corrected random amplitude samples

23. 2015/6/2823 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

24. 2015/6/2824 MC – IC9 data comparison V01-07-04 (DC1) IC-9 data ~E -4

25. 2015/6/2825 MC – IC9 data comparison V01-09-01 (DC2) IC-9 data (Only 5% of total data sample)

26. 2015/6/2826 MC – IC9 data comparison V01-09-01 (DC2) IC-9 data (Only 5% of total data sample)

27. 2015/6/2827 Muon bundles 1PeV bundle of 1000 muons (1TeV/muon) Npe only would not be able to resolve tracks We do not know cosmic ray intensity in EHE We do not know cosmic ray composition in EHE Corsika has not reconstructed AGASA/Auger data 9-strings “ EHE ” REAL DATA Log(Npe) Cos(zenith) Build Empirical Model IceSim

28. 2015/6/2828 GZK  Signal Roadmap to analysis Atmospheric  BG Standard Candle In-Ice data 9-strings unblinded data Energy Npe Log(Npe) N DOM Cos(zenith) Log(Npe) Cos(zenith) Log(Npe) IceSim Tune Energy Eff. Area Extrapolate to signal domain Empirical Model Tune December 2006 On-going November 2006 May 2007

29. 2015/6/2829 The EHE track reco : PDF 10 17 eV 50 m 100 m 200 m 300 m 1 p.e.

30. 2015/6/2830 The EHE track reco 100 PeV Parameterized function MC data Profile (MC data) Waveform Comparison Energy Reconstruction!

31. 2015/6/2831 Sensitivity/Bound Quasi-differential method S. Yoshida et. al. (2004) Phys. Rev. D 69 103004 Bound: energy dependent!! This is MODEL independent!!

32. 2015/6/2832 The Goal in 2007 Publish the 1 st results of EHE search Publish the 1 st results of EHE search http://www.ppl.phys.chiba-u.jp/research/IceCube/EHE/