1 / 9

Neutrino Point Source Searches with AMANDA-II m -DAQ

This report highlights the progress made in the search for neutrino point sources using AMANDA-II m-DAQ. The methodology has improved, with a sensitivity improvement of ~30%. Utilizing energy information and Nch improves the discovery potential, with a total improvement of 45% compared to the binned search. The data analysis from 2005-2006 shows a significance of 3.82s. Plans for the future include combining data sets and finishing the analysis by the end of the year.

woodley
Download Presentation

Neutrino Point Source Searches with AMANDA-II m -DAQ

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Neutrino Point Source Searches with AMANDA-II m-DAQ Jim Braun IceCube Fall 2007 Collaboration Meeting

  2. Progress Since Lake Geneva • 2005 unblinded: • http://www.icecube.wisc.edu/~jbraun/2005_point_source/ • 2006 unblinded: • http://www.icecube.wisc.edu/~jbraun/2006_point_source/ • Improvements in methodology: • http://www.icecube.wisc.edu/~jbraun/2006_point_source/sensitivity.html • Internal report on methodology coming soon

  3. Review: Sensitivity Improvement: ~30%

  4. Use of Energy Information • Mean number of signal events required to reach 5s in 50% of simulated experiments at d=42.5o • 2006 data is background • Compare unbinned search with and without using Nch • Utilizing Nch information improves discovery potential for spectral indices g < 3.3 • Effect is 30% for E-2, representing a 45% total improvement over the binned search

  5. 2005 Unblinding log10(p-value) 80% Chance of observing p = 0.064 given 26 sources Highest Significance: 3.58s Chance Probability: 69%

  6. 2006 Unblinding Significance 12% Chance of observing p = 0.005 given 26 sources Highest Significance: 3.58s Chance Probability: 84%

  7. 3.82s Significance 2005 + 2006 Sensitivity of 2005-2006 analysis near E2dF/dE = 7x10-11 TeV cm-2 s-1 5 year search: 5x10-11 TeV cm-2 s-1 * 10-11 TeV cm-2 s-1

  8. Plans for 2000-2006 • Expect to combine 2005+2006 with 2000-2004 Zeuthen five year data set • Will not reoptimize cuts for 2000-2004 • Expected sensitivity: ~3x10-11 TeV cm-2 s-1 • Finish by the end of the year • Will not include 1997-1999 B10 data as previously planned • 465 total events in most recent 1997-1999 analysis • Considering poorer angular resolution and 25% contamination, equivalent to less than 40 days AMANDA-II livetime

  9. The Crab(Because Everyone Keeps Asking) • 2000-2004: Excess (10 events, 6 expected) • 2005-2006: Slight excess • 2006 IC-9: Excess • If the excesses are indeed a signal, we would possibly observe ~3s for this source • Significance reduced to ~2s with a catalogue of 26 sources • Depends on Nch values of events observed in 2000-2004

More Related