October 20

Phone bridge number 617 324 7520 , Time 5 pm to 7pm pm, up to 10 connections, phone # is correct
Agenda

  1. TPC - status of calibration - Gene
  2. TPC - status of handling of deconvoluted hits by Sti
  3. PPV - understanding of missing CMB tracks
  4. Vernier scan analysis, W xsection - Ross
  5. BTOW absolute calibration: mip-less & slop-less towers - Matt & Joe
  6. Justin ?
  7. Scott ?
  8. Matt W-> di-jet update
  9. Bernd - Latex paper
  10. Bernd - update on STAR management support for next data production pass
  11. Jan - update on deploying STAR software on Amazon Compute Cloud (EC2)
  12. add yourself

October 13

Present: Hal, Jan, Ross, Will, Scott, Justin, Dave.

Proposed 2010 Spring APS abstracts:
  1. Overview of the STAR W spin physics program in polarized proton-proton collisions at ps = 500GeV at RHICT - Bernd
  2. Absolute Cross Section for W+ and W− Boson Production at ps = 500 GeV at STAR - Justin
  3. First measurement of the parity-violating spin asymmetry AL for W± boson at STAR - Jan
  4. Determining sampled luminosity in proton-proton collisions at sqrt(s) = 500 GeV at STAR using the vernier scan technique - Ross

DNP W talk by Joe: final version
Ws measured by STAR in 2009 run

Minutes

  1. vernier scan agrees with Angelika in fitting time dependent shape, still disagrees with Bill on estimate of BHT3 xSection (blog)-Ross
  1. Justin - new away side veto blog
    Algo identifying 3-jet events: 3 independent seeds in TPC, BTOW, ETOW, take highest PT track away in phi, delPhi<90 deg, away cone delR<0.5, 2x2ET/coneET<0.3. Rejected 9 events from run 9 & large 2x2ET.
  2. Jan - model of Jacobian peak w/ 3D Gauss smearing blog
  3. Scott - longitudinal smearing of initial-state parton momentum blog 
  4. Longitudinal initial state momentum reflect in reco p_Z for Ws blog, Justin

September 29

Present: Hal,Joe, Ross, Jan, Scott, Justin, Gene
Minutes

  1. TPC calibration - Gene: T0 did not fixed CMT problem, PPV need investigation
  2. BTOW absolute calibration - Matt
  3. figures to be released as 'STAR Preliminary' for DNP - Joe - link
  4. Vernier scan update - Ross
  5. h /h- ratio for QCD, Ws - Justin
  6. uploaded spin DB for pp500 short , longer- Jan
  7. AL for W+ - Jan
  8. W paper 1 - Bernd
  9. AOB
  10. Announcements
  11. updated run list w/ pol pattern pp500-runList-ver4.csv

September 22

Minutes

  1. PPV - status of evaluation of SL09b production, missing CMB tracks
    PPV blog:
  2. TPC calibration - Gene
  3. BTOW calibration
  4. W analysis
  5. W paper 1 - Bernd
  6. CNI polarization of protons during 500 GeV run (Data files: ): Yellow Fill dependence: and Blue Fill dependence: - Bernd
  7. Background Estimation - link
  8. AOB
  9. Announcements

September 15, 2009

Minutes
Present: Hal,Jan,Will,Ross,Joe,Bernd,Justin,Scott, Gene

  1. TPC - Gene reported slewing correction for clusters is in DB. T0 should be in DB at the end of the week. Then we can ask for re-production of one fill to see if tracking efficiency improved at Z~0
  2. PPV - status of evaluation of SL09b production - no report
  3. Vernier scan - Ross
  4. BTOW calibration 
  5. Understanding QCD e+/e\- ratio at ET \[15,20\] GeV - Scott.
  6. Status of W analysis:
    1. Joe detailed presentation of alternative W-algo, run 9 data & M-C - link. Results are consistent with Jan's analysis. 2 independent algos leading to similar output improve confidence in the result.
    2. Jan's ver 4.2 : bug fix, upgrade, answers to questions after last week spin PWG presentation , slides
    3. Justin : using ETOW in W-algo improves S/B in ET~20 GeV region, allows background estimation for di-jets escaping through not existing East endcap.
  7. Layout of paper 1: Draft: Files: Bernd
    Decisions:
  8. Announcements

September 8, 2009

Present: (I lost my notes, sorry)

  1. BTOW final 5% calibration
  2. TPC
  3. PPV - status of evaluation of SL09b production - Rosi
  4. Vernier scan - absolute BHT3 normalization - Ross
  5. W-background estimation based on run 9 pp500 data : Scott/Justin
  6. spin info : fill pattern, bXing offset - update (Jan)
  7. run QA (first week) Hal, left overs from later days Dave
  8. RHICBOS cross-section plots (Bernd)
    Summary: The ratio integrated over pT is:
  9. Overview of previous W measurements Bernd
  10. task assignment (a.k.a Run 9 data publication strategy ) - please take responsibility
  11. Status of W analysis:
    1. Joe
    2. Jan's blog
  12. What do we show on Thursday to spin PWG, how many details?
    #AOB

September 3, 2009

Present: Scott, Justin, Joe, Willie, Jan, Ross, Bernd, Gene, Hal

Minutes

  1. result of analysis of SL09b production
    1. Jan (Drupal blog )
      1. presentation of W-algo ver 4.0 using BTOW & TPC, for 1M input events
      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
      4. Suggestions: count # of track pointing to cluster; compare ET vs. PT for electron
    2. Joe adopted his algo developed on M-C to work with Run 9 data
      • removed BSMD, changed to tower-based center of gravity, relaxed cuts: PT>5 GeV/c, delEta & delPhi<0.5, isoFraction of 0.8
      • Uber-preliminary result for 1M input events results plots
  2. Run 9 data publication strategy has been discussed and in general agreed up. Use of BSMD for PRL paper 1 was discussed - it is worth trying.
  3. Questions/comments
    1. 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?
      • 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.
    2. Jan: Lets plan to use BFC filter to get rid of not-BHT3 events from pp200 data. Process LT~10/pb. Needs: adopted filtering code, run selection, 1mm accuracy of TPC calibration (within month), supported production request
    3. Joe: estimate TPC tracking efficiency difference for e+ vs. e-
  4. Ross - vernier scan analysis
    1. lots of detail about how I do the fit - Ross is looking for explanation why his calculations are off by ~4 orders of magnitude. knows
    2. Comparison of Vernier scan from 2 pp500 runs - background visible in both
    3. Comments/suggestions:
      • post study with eliminated TP affected the most by the beam background - no link yet. Even removing the noisiest high tower patches still leaves considerable amounts of background. ADD LINK
      • post input data from Angelika Raw data from Angelika
      • exercise the code on mock data to verify it reconstructs width correctly
  5. Joe - BTOW relative gains, not yet
  6. new phone meeting time moved to : Tuesday 5-6 pm EDT
  7. low TPC tracking efficiency at eta~0. Gene: may by a better T0 suffice to correct it - lets wait for the outcome. How can we address this issue?

August 27, 2009

Present: Willie, Matt, Jan, Hal, Rosi, Justin
Minutes

  1. Evaluation of SL09b production
  2. TPC calibration, Gene: Could you describe realistic timeline for complete TPC calibration: PadrowT0, Twist, ShortedRing
    Next production should include all of the above
  3. ETOW gains - Scott/Justin
  4. BSMD relative gains - Willie, uploaded to DB with flavor Wbose
  5. Vernier scan - Ross, all 6 pp500 runs have been produced.
  6. Announcements

August 20, 2009

Present: Rosi,Hal,Jan,Justin,Gene,Ross

  1. Production status
  2. ETOW absolute calibration to compensate for incorrect TCD phase used during data taking. Two alternative methods are used:
  3. Status of Vernier scan was presented by Ross:http://drupal.star.bnl.gov/STAR/blog/rcorliss/2009/aug/20/absolute-cross-section-notes-5
    The rate of STAR events vs. time (fig 1) is described by the product of 2D gauss functions representing X,Y spread of ions in both (identical?) beams. We know from Angelika the relative displacement of both beams for every time period of Vernier scan. Ross fits 2 params: sigX, sigY - the width of gauss.
    Fig 3 ('counts vs. steps') shows anticipated result. The value of 'skfNN' is absolute cross section of STAR BHT3 trigger in units TBD and assuming no hot tower correction is needed.
    Ross add constant background to better describe the observed rate , yet still peaks are under-predicted.
    He will continue to try to model vernier scan better and is awaiting for muDst from 6 Vernier scan runs from ongoing production to be able to assess how stable is the value of skfNN.
  4. run QA : Hal will do QA of the first week of pp500 data within next 30 days, backward in time. (Thanks^2, Hal)

July 16

  1. Joe/Gene - spacecharge and gridleak - Having had Gene diagnose that there were issues with the gridleak in the current calibration I went back with his estimated numbers and re-ran it, but there may be problems with that now and it may take another iteration or two to find our way to the correct place to be.
  2. Hal - QA - Didn't call in, but he said at the analysis meeting that he would do more QA (the rest of it).
  3. Rosi/Jan - PPV - Rosi was working on the beam tilt part of it now and it sounds like she is getting good results and everything so it won't hold us up once we get the sc/gl ready.
  4. Willie - BSMD - Showed his progress (see the email he sent around)
  5. Ross - Vernier - See his drupal page
  6. Scott - ETOW gains - See his presentation. He started looking at the gains in each sector now with the data from the timing scans, but using "Scott's method" for calculating the gain (last slide). It looks like sectors 5 and 6 are actually different from 3 and 4 when you use "Scott's method". He thinks he will have a gain for each tower calculated by the end of next week though. So excellent progress there.

June, 25

Present: Gene, Scott, Joe, Jan, Willie, Ross,Rosi

  1. TPC, Gene:
  2. BSMD was never aligned with TPC for real data - brought by Scott. We could (should) use high pT electrons reco in TPC for alignment. L2W events will be ideal. Jan asked Matt about the change in BTOW geometry last year to add dead material at eta=0. Matt said this change did not affected BSMD geometry model, so we have in reco what we believed was true ca. 1998. It needs to be verified with actual 2009 data.
  3. ETOW gains: Scott got from Alice timing scan data and will analyze them. We discussed reliability of gains for towers with significantly wrong timing when gain correction factor is of 10 or more. It is important to look also at derivative of d_gain/d_timing and flag as bad towers with large correction or large derivative. Details TBD.
  4. beam line constrain: Rosi was finalizing 3D fitter based on Minuit. 3 days later: code is running but convergence is not great, few problems are identified, e.g. too many fit params. Rosi & Jan are working on this - top priority, needed for production to start.
  5. preparation for data production:
  6. run QA: ver 3 of run list incorporating peoples run QA prepared so far has been assembled: pp500 run list ver3c , 80% QAed, updated June 29

June 18, 2009

Present: Gene, Scott, Jan, Willie, Hal, Ross

  1. TPC, Gene:
  2. BTOW, ETOW gains - no progress.
  3. BSMD : Willie is working '''slopes for individual strips'''. He run over 10k VPD-minB events and got  this \[[Media:BSMD-strips-Picture 16.png|2D plot of module 119]\] and spectra \[[Media:BSMD-strips-Picture 15.png |individual strips]\]. The  available 1.5M vpd-minB events should be  enough to  fit every strip. If not we will merge strips.
  4. BSMD geometry: Scott asked how well we know '''relative position of BSMD vs. TPC'''. It is [followed up on emc2-hn |http://www.star.bnl.gov/HyperNews-star/get/emc2/3250/1.html]. <p> Scott once did \[[Media:Conversions-distace-Scott.pdf | simple calculation for photons that convert to e+/e- pairs]\] in the SVT, attached. <br>The relevant equation is on the bottom left.  For the W -> e, we have r_1 = 0, r_2 = 2.3 m (approximate radius of BSMD planes), and B = 0.5 T.  With these numbers, you get the simple relation<br>  dPhi (cm) = 40 / pT (GeV)<br>For example, an electron of 40 GeV pT will deflect in the phi direction by 1 cm relative to the same e- of infinite pT.  This is probably good to better than a few %.
  5. run QA : Scott is working on his fills.

no meetings for few weeks

May 21, 2009

Agenda:

May 14, 2009

no meeting

May 7, 2009

Present: Gene, Scott, Joe, Jan, Willie, Hal, Dave

  1. TPC:
  2. ETOW calib:
  3. BTOW: pedestals and status tables uploaded to DB. BTOW status tables done & QAed
  4. Hal run QA comments , spreadsheet PPVEvalBlogPPVEvalBlog