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Enhancements in Imaging Interferometry and Neutrino Search Analysis - Meeting Overview

In the July 20, 2009 meeting led by Stephen Hoover, significant updates on imaging interferometry were shared. The focus shifted from plotting largest cross-correlation peaks to averaging full interferometric images per event. New findings highlighted the presence of “stripes” in images, tied to horizon features and solar peaks. Neutrino search methods were also refined, incorporating new pseudo-bases and adaptive filtering adjustments. Potential cuts for event selection were proposed, aiming to enhance the accuracy of neutrino detection by removing events based on specific likelihood metrics and distances.

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Enhancements in Imaging Interferometry and Neutrino Search Analysis - Meeting Overview

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  1. ANITA-1 Analysis Update Collaboration Phone Meeting 20 July 2009 Stephen Hoover

  2. Imaging Interferometry • Since last meeting, I have begun summing full interferometric images • Previous plot: largest cross-correlation peak from each event • Now: Average together full interferometric image from each event • Subsequent plots show the summed image from events 4,300,000 – 4,340,000 • Filtered to remove < 200 MHz, 220 – 290 MHz, > 1200 MHz

  3. v-pol h-pol

  4. v-pol h-pol

  5. v-pol h-pol

  6. Notice that the image has “stripes” Prominent strip associated with the horizon Why? What are the other stripes? V-pol Note that Solar peak is ~ 0.028 in v-pol horizon

  7. The same stripes in the h-pol: H-pol Note that Solar peak is ~ 0.030 in h-pol horizon

  8. Neutrino Search Cuts • Base cuts: • Run on 10% sample with no adaptive filter to search for anthropogenic sources • Add new “pseudo-bases” to my base list • Set neutrino base cuts based on shortest straight-line distance from reconstructed event to base and on smallest value of Andres’s log-likelihood-inspired metric (ELOG #469) • LL = (Δθ/σθ)2 +(Δφ/σφ)2 • σφ = 0.9°, σθ = 0.35 °

  9. 10% sample, reconstructed events using satellite filter only (no adaptive filtering) ~198,300 events plotted Misreconstructions 9

  10. Resume adaptive filtering, but relax cross-correlation cut On next slide, plot distance of this section, and LL of this section

  11. # neutrinos with LL < 20 : 3.6% LL < 30 : 5.2% LL < 40 : 6.8% Potential cuts Estimate volume removed by using icemc to find neutrino exit points # neutrinos with dist < 40 km : 7.8% dist < 50 km : 10.7%

  12. Proposed cuts • Remove events with • Base LL < 30 • Base distance < 40 km • or < 150 km from McMurdo • < 150 km from South Pole • < 75 km from Mt. Vinson • This removes 11% of potential neutrinos

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