2000-2006 AMANDA Point Source Analysis
Event Selection
Methodology
Sensitivity & Discovery Potential
Unblinding Proposal
Results
Questions and Answers
Systematics, Publication, and Figures
LS I +61 303 Periodic Analysis
Solar WIMP Analysis
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| NASA/ESA Hubble |
Event Selection
We compared the point source sensitivity for the 2005-2006 data using either set of cuts.
The 2000-2004 cuts are tighter and offer better purity, whereas the 2005-2006 cuts provide better sensitivity at the horizon. To acieve the best possible event selection, we optimized event selection with a support vector machine. However, our results are only marginally better than with the 2000-2004 cuts, except near the horizon, where we find significant improvements. We choose to use the 2000-2004 cuts with a modification to correct the sensitivity loss near the horizon. We apply the 2000-2004 cut for the range
1.5o < δ < 90o and a cut on SVM output parameter for δ < 1.5o. We also apply the cut Zenith[Bayesian] < 90o to 2005 and 2006, as this indicates an error condition with the Bayesian fit. The cut eliminates 3 events.
The Final Event Sample
The final sample contains 6595 events:
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The efficiency for atmospheric neutrinos (E-2) is 22.5% (33.6%) from trigger level. The contamination from downgoing muons is ~5% away from the horizon. Application of the cuts results in the following effective area and energy distributions:
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Distribution of Final Sample Cut Parameters (Declination > 5o)
