Page History

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1. result of analysis of SL09b production
   1. Jan (Drupal blog )
      1. presentation of W-algo ver 4.0
      2. Run 9 results as of September 1 | Slides
         1. histogram-based dump of selected events
         2. Larger collections of events: di-jets , W-candidates , Z-candidates
         3. Matt's 3 interactive events in skechup or just one view , at Scott's angle
         4. sequential histograms from pass through 1M events (LT=~8/pb)
      3. M-C simulation analysis histograms for Pythia W-events (LT=320/pb) , filtered QCD-events LT=6.3/pb, Z-events LT=4200/pb
   2. Joe
      1. Uber-preliminary result from Joe's algorithm showing W peak and a hint of a Z peak plots
2. discussion of Run 9 data publication strategy
   1. Questions/comments from former prominent STAR collaborator:
      • Could the Z-candidates be di-jets? cosmic rays? Do you try to do any charge sign discrimination on the electrons (i.e., opposite sign on the 2 sides for "Z-candidates")? Phi distribution does not appear indicative of cosmics.
      • Most importantly, is "Jacobian peak" absent when you look at 200 GeV data with the same algo and cuts?
        • Jan: Mike B. just confirmed we could use BFC filter to get rid of not-BHT3 events from pp200 data. This makes another mini-production request of pp200 data a viable option (there is a small issue thou).
      • Lots of questions, but this does look really promising, seems to give you NN W candidates NN Z candidates in the barrel region. It's a bit surprising that such a crude isolation cut, with no away-side ET upper threshold or SMD criterion, would suppress jet background so effectively. We always thought we would have to work much harder than this to unveil a signal above background.
3. Ross - vernier scan analysis
   1. lots of detail about how I do the fit
   2. showing now a cross section (which Ross knows can't be right)
4. Joe - BTOW relative gains
5. new phone meeting time - no conflict :
   1. Monday 4-5pm EDT
   2. Tuesday 5-6 pm EDT
   3. Friday 10-11 am EDT
6. TPC tracking efficiency at eta~0. How can we address this issue?
   Below is suggestion from Jerome. In short he offers a welcome at BNL.
   • The convoluted hit issue brought during Jan's presentation: Yuri will show Jan how to access/recognize those. It was generally understood that using those in tracking would require
     • a study of effect in real data
     • a response simulator simulating those convoluted hits so embedding would be properly handled (right, it is not handled in embedding not tracking so goes into a reco inefficiency).
     • We welcome Jan coming at BNL and working with Yuri on characterizing the effect on tracking. A month work would bring a pretty good study (still the embedding is questionably achievable within the workload and timeframe)
7. AOB

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