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Review Committee Meeting Friday 10 March 2006 08:00 PST / 11:00 EST

Minutes: Friday 10 March 2006 08:00 PST / 11:00 EST

Agenda and Contact Info

Agenda

  1. Discuss S5 untriggered search results [ HTML ]

Contact Info

AccuConference teleconferencing service:
   Phone: 1-800-704-9896, participant code: 038621#
   International callers ++1-404-920-6472 with same code

Minutes

  1. Sensitivity curves: what is the way we should refer to the SRD goal curve now? Need to ask Peter Saulson.
  2. CorrPower is not essential to the high-threshold analysis. But it needs to be noted that it could be used to eliminate zero lag triggers but was not used in efficiency determination.
  3. Need to stress that the S5 data is improving. This report deals with "early S5" data.
  4. How were WB thresholds chosen? Low threshold: to achieve 20 uHz after amplitude cut; high threshold: to achieve a certain number of triggers.
  5. Which S4 sensitivities should we compare to? Final results or the results after only the amplitude cut? Use final S4 results. Stress that this is comparing a high-threshold search (which is missing certain components of the pipeline) with a low-threshold search. This way there aren't multiple S4 sensitivities being presented.
  6. hrss vs. hrss plot: narrows for loud signals, but there is still a broad halo. What is the origin? Probably due to high frequency signals.
  7. Bias in time reconstruction (see here and here). This occurs for low frequency MDC frames. It seems to be a discrepancy between the logged time and the time reconstructed from the MDC frame. Perhaps it has something to do with calibration. Check with Keith Thorne. Also, Igor will try doing h(t) check.
  8. 38 events in high threshold search. Only two pass all cuts and these were in time slides. Only one of the 38 was at zero lag but it failed the amplitude consistency check.
  9. One of the surviving background events (event 10) has an associated dq flag L1:OV_MC2. This flag has a high deadtime (10%) and safety is not yet certain. It is not clear that the trigger should be vetoed by the dq flag.
  10. Zero lag event q-scan and event display. No evidence of an environmental cause. Data quality flags suggest photdiode saturation in H1 (H1:OV_LSC, H1:PD_OVR). Clearly stuff is happening in the auxiliary channels.
  11. What will be presented is just statistics of events. Number of events; number surviving after each cut.
  12. Sensitivities: would be nice to see these superimposed on noise curve as a sanity check.
  13. Suggest not stating these as S5 sensitivities but rather as "early S5 sensitivities" because we may want to also have different "mid S5" and "late S5" sensitivities that are somewhat different. (All prelimnary of course).
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