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New cut criteria for the full IceCube EHE performance paper

New cut criteria for the full IceCube EHE performance paper. Aya Ishihara For the EHE phoneconf 12-12-2007. E 1. Our cuts rely on energy-NPE relation. NPE-cos q plane. bg. sig. signal domain. sig. bg. Energy-NPE plane. Simple cut on NPE-cos q plane. signal (GZK).

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New cut criteria for the full IceCube EHE performance paper

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  1. New cut criteria for the full IceCube EHE performance paper Aya Ishihara For the EHE phoneconf 12-12-2007

  2. E1 Our cuts rely on energy-NPE relation NPE-cosq plane bg sig signal domain sig bg Energy-NPE plane

  3. Simple cut on NPE-cosq plane signal (GZK) background (realdata based) signal domain signal domain event rate

  4. Geometry Dependence • So far we used the NPE-energy relation regardless of their track position • Using some geometry information, we can include the simple relation that far tracks gives less NPEs

  5. How to Select In-side/Near Tracks ATWD FADC [V] [mV] 42m from source [m sec] [nsec] ATWD FADC 144m from source

  6. Position Dependence of NPE-energy relation Event-total ATWD based NPE > Event-total FADC based NPE sig bg t m E1 Event-total FADC based NPE > Event-total ATWD based NPE sig bg E1 t m

  7. A Check with SC events ATWD We may not rely on magnitude/shape of MC waveforms, but… this general trend that the more ATWD the closer, the larger FADC/ATWD ratio the farther is pretty robust (kind of 2 bin analysis) FADC uncertainty FADC > ATWD ATWD > FADC log(FADC/ATWD) Distance from SC

  8. Selecting Tracks from Above MC truth cosq distributions |cobz|<300 |cobz|>300 MC truth cosq |MC truth cosq| Center of brightness z position [m] Also Linefit has dependence on |cobz| position |cobz|<300 |cobz|>300 D cosq D cosq COB z position [m]

  9. C A B D Categorize Tracks • Select track geometry by these 2 parameters • |Center of brightness z position| and • (FADC NPE)/(ATWD NPE) ratio

  10. A B C D Background Signal Event Budget Before Cut All events NPE>10000

  11. A B C D Background Signal Event Selection

  12. Event Rates • Applying A-B-C-D dependent cut defined by 4 lines on the NPE-cos q plane gives you…

  13. old this work Sensitivity

  14. Effective area

  15. Summary • Geometry can be selected by its COB-Z and ATWD/FADC ratio • we can achieve as good as 1 events per year without additional info! • Use this for string 80 performance paper

  16. Outlook • Places for work on ‘category D’ - far and deep events • Places for better reconstruction for cobz > 300m events (especially for backgrounds) • Use of channel-wise ATWD/FADC ratio information for better identification of track distances ~ weights for NPE parameter using standard candle information with MC • A simple/quick NPE-Energy improvement is possible using both ATWD+FADC combined NPE info. • Different unblinding strategy will be required (wanna use at least log(NPE) > 4 events for analysis), get this ready by spring • Simplifies IceTop coincidence candidate selection that are likely to be the through-going category-A events

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