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

August 27, 2009

Minutes (not finished editing)Present: Willie, Matt, Jan, Hal, Rosi, Justin
Minutes

1. Evaluation of SL09b production
   • Matt - electrons in BTOWGene - TPC accuracy
   • Rosi - vertex finder
   • Jan - QA of vertex finder for L2W events
2. W analysis: who is working on it? What is your strategy? Do you need help?
   • Ross
   • Jan : wants to use default jet finder (for isolation and away side veto cuts) and has 0 experience.
   • anyone else ?
3. • Jan - QA of vertex finder for L2W events
   • Jan : wants to use default jet finder .C macro
   jet finder tasks (Jan needs help), .C macro
4. decide on jet finding params, detectors: TPC, BTOW, ETOW
5. decide on data massage:
   • TPC track PT saturated at 10 GeV/c
   • identify/reject hot unmasked towers
   • temporary BTOW abs calibration
   • ability to select prim tracks not from other than first primary vertex
   • compute not only jet ET but also uncertainty of jet ET (to identify & ignore huge but uncertain jet energies)
run jet finder over 600 runs, QA performance, uniformity per run, per fill
6. TPC calibration, Gene: Could you describe realistic timeline for complete TPC calibration: PadrowT0, Twist, ShortedRing
   Next production should include all of the above
7. ETOW gains - Scott/Justin
   • uploading 2009 gains to DB http://drupal.star.bnl.gov/STAR/blog/stevens4/2009/aug/05/run-9-eemc-tcd-phase-and-effective-gains
   • Are we done? Do we see tower-only pi0 peak with those gains ?
8. BSMD relative gains - Willie, uploaded to DB with flavor Wbose
   • final writeup about relatve calibration for pp500 http://drupal.star.bnl.gov/STAR/blog/wleight/2009/aug/07/determination-bsmd-relative-gains
   • upload rel gains to BSMD with special flavor
9. Vernier scan - Ross, all 6 pp500 runs have been produced.
   • http://drupal.star.bnl.gov/STAR/blog/rcorliss/2009/aug/27/absolute-cross-section-notes-6
   • Is BHT3 x-section consistent over 6 runs?
   AOB
10. Announcements
    • Jan: the following runs will be tagged as Xx because there is 0 or <100 events with found vertex :
      R10084013, R10088103, R10081024, R10095032, R10085022, R10088060, R10085103, R10087007, R10093049, R10085118
    • corrupted muDst: /star/data33/reco/production2009_500Gev_c/ReversedFullField/P09ib/2009/097/10097044/st_W_10097044_raw_6180001.MuDst.root

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