Neutrino Point Source Searches with AMANDA-II m -DAQ

1. Neutrino Point Source Searches with AMANDA-II m-DAQ Jim Braun

2. AMANDA-II complete 2000 D. Steele: Phys.Rev.Lett.92:071102 2004 2001 Y.-R. Wang: Phys.Rev.D71:077102 2005 2002 M. Ackermann: Phys.Rev.D75:102001 2007 2003 2004 2005 Unblinded in 2007 by J. Braun 2006 Unblinded in 2007 by J. Braun m-DAQ decommissioned m-DAQ Point Source Searches Would like to combine all years into a reasonably unified final event sample and publish point source result in early 2008 Sample will also be used by John K. and others

3. Data Filtering • Two main data sets: • 2000-2004: Filtered to L3 (~1G events  ~1M events) with Zeuthen scheme • 2005-2006: Filtered to L3 with UW scheme • Zeuthen and UW filtering very similar • Do not need to refilter to achieve a reasonably uniform event sample

4. Final Event Sample • Final event samples are significantly different! Zuethen 2000-2004 • Strong likelihood difference cut (downgoing vs. unconstrained) • Strong P_hit smoothness cut • Strong paraboloid error cut • ~1K events/year High Purity UW 2005-2006 • Weaker likelihood difference cut at horizon • Weaker P_hit smoothness cut • Strong paraboloid error cut • Weak direct length cut Maximum sensitivity near horizon

5. Event Selection • Need a uniform event selection for all years • Non-uniform selection is confusing • Non-uniform selection would tend to combine the undesirable propertiesof both selections • Choose Zeuthen cuts for final event sample • Match 2000-2004 publication • 91% of events from 2005-2006 with Zeuthen cuts are already contained in UW sample

6. Final Event Sample 6166 Total events in final sample

7. Normalization • Data normalized to average of Barr et al. and Honda 2006 model atmospheric neutrino predictions • Corrects for uncertainties in MC (e.g. ice properties, OM sensitivity) • Final normalization: 0.901  Ratio of starting/final normalization indicates sample is 97% pure

8. Final Sample

9. Final Sample