coherent WaveBurst Review Meeting 28 May 2009 09:00 Pacific / 12:00 Eastern
Agenda: Thursday 28 May 12:00 Eastern
- Study of the H1-H2 disbalance test [wiki].
- Discussion of how to deal with calibration uncertainties [ppt].
Dial-in number: 1 800 704 9896 International dial-in: +1 404 920 6472 Conference code: 5374 2349 #
AttendanceStas, Sergey, Virginia, Michele, Patrick (minutes).
H1-H2 Disbalance cut in HFS
- The energy disbalance postoproduction threshold was been originally implemented to kill spurious events in the low frequency band (<200 Hz).
- Initial HFS: Applied this cut, to stay similar to LFS. Cut has no effect on "raw" background and simulation results on HFS. Comparison of results pages: look identical with and without cut when no calibration uncertainties applied.
- However, cut harms the detection efficiency in presence of calibration systematics, especially a differential amplitude systematics beteeen H1 and H2. See DisbalanceIssues wiki page. Impact especially bad for H1+7%, H2-28% amplitude sensitivity adjustment.
- Without cut, impact of calibration uncertainties very small for 4X network, small for 3X network, "manageable" (SK) for H1-H2.
- Therefore decided to drop this cut for HFS (keeping the rest of the search parameters frozen). cHH cut not used in HFS production runs, final results.
- Note: Results web pages say cHH cut applied. SK says these text values are hardcoded in script, but not actually applied. These scripts are updated manually, once per network.