May 11, 2010

Phone bridge *number: 617 452-5208 * , time 5pm to 6:30 pm , 10 lines
Agenda:*

  1. Ongoing data analysis
    1. Vernier Scan/Luminosity - Resolved the dijet discrepancy by comparing to ZDC. pdf, blog
    2. TPC Simulation Tickets - Gene
    3. Theory Calculation - AL for Z Production - Bernd link
    4. More thoughts on tracking at mid-rapidity - Justin and Scott pdf
  1. Addressing GPC Questions
    1. TPC calibrations sufficiency - Joe very rough draft GPC presentation
    2. Electron purity - Who is going to make the slides?
    3. Background reduction/characterization -Justin draft GPC presentation
    4. Polarization - Jan's Email
    5. Rellumi - Jan's Email

May 4, 2010

Agenda:

  1. Ongoing data analysis
    1. Vernier Scan 
    2. TPC Simulation Tickets - Gene
    3. Theory Calculation - AL for Z Production - Bernd
    4. STAR Note update?
  1. Upcoming proceedings
    1. Moriond - Justin
    2. Lake Louise - Joe

April 27, 2010

Agenda:

  1. Ongoing data analysis
    1. Vernier Scan - BHT3coin and BHT3 agree, save 6% in the direction we want
    2. TPC Simulation Tickets - Gene
    3. (Attempt at) Understanding Track <z> distribution - Justin
    4. update on W-background model ?
    5. Theory Calculation - AL for Z Production - Bernd

April 20, 2010

Agenda:

  1. Ongoing data analysis
    1. Vernier Scan - Ross - Shift in early runs between BHT3coin and BHT3 luminosity
    2. TPC Simulation Tickets - Gene
    3. Theory Calculation - AL for Z Production - Bernd
    4. Z Background Treatment in AL Calculation - Joe, Justin

April 13, 2010

Agenda:

  1. Ongoing data analysis
    1. vernier scan - Ross Q: when presentation to spin PWG
    2. BTOW calibration - Matt E/P pp200 Run 9, Q: target date for DB upload
    3. TPC response (data/MC) - preparation for embedding , Justin
    4. embedding request status -Q: do we have concise writeup? When will it be presented to spin PWG?
    5. theory : x-section and AL fro p+p --> Z - Bernd
    6. removing Z's from data-driven background - Justin
  2. Papers
    1. W AL paper
      1. revised background estimate - Joe : equations, analysis, SN update
      2. summary of GPC presentation - Bernd
      3. Q: what do show at spin PWG on Thursday ?
    2. W x-section paper : what are next milestones (who is responsible, dates)
  3. AOB

----h4. April 6, 2010

Agenda:

  1. Ongoing data analysis
    1. vernier scan - Ross (BHT3-coin vs. L2dijet)
    2. revised background estimate - Joe's Math
    3. preparation to embedding: TpcRS QA - Justin
    4. work around beam line constrain for simu - Jan
    5. how do we correct AL for polarized background A, B
  2. Papers
    1. W AL paper home page: PRL ver 1.40,
    2. STAR Note ver 2.00 Update from Joe
    3. W x-section paper : where are we?
  3. AOB
    ##Oleksandr joined W-list.
    ----few weeks passed, many face to face meetings

    March 23, 2010

Agenda:

  1. Ongoing data analysis
    1. vernier scan - Ross -nothing
    2. revised background estimate (using signed pT balance cut) - Joe ?
    3. add more ...
  2. Papers
    1. W AL paper home page: PRL ver 1.0 , STAR Note ver 2.00
    2. W x-section paper : where are we?
  3. AOB
  4. upcoming talks during STAR collaboration meetings:
    1. Justin: Junior day
    2. Bernd/Jan: presentation of W AL paper to spin PWG & asking for GPC
    3. Jan : plenary talk on Ws from run 9

March 9, 2010

Phone bridge *number: 617 452 2163* , time 5pm to 6:30 pm , 10 lines
Agenda:

  1. Ongoing data analysis
    1. vernier scan - integrated luminosity increased >10% using BHT3 coincidence, BHT3 coincidence trigger looks fairly stable vs JP1.
    2. TPC calibration, usage Gene , Justin phi dependence , Justin <z> dependence
    3. add more ...
  2. Papers
    1. W AL paper : PRL, STAR Note
    2. W x-section paper : Scott's spin PWG presentation
  3. * W AL projections* new, old forward, old mid-rapidity
  4. upcoming W-talks
    1. Justin Moriond
    2. Hal high-PT workshop BNL
  5. AOB

March 2, 2010

Agenda:

  1. Ongoing data analysis
    1. Re-analysis of vernier scan Ross's blog leads to a more gaussian shape, and reduced systematics.
    2. Study of W trigger efficiency Justin's blog
    3. more .... ?
  2. Papers
    1. W AL paper layout & task list
    2. W x-section layout and task list
      • Comments from Jan are added to the layout-blog, in particular:
        1. current task list is not suited for the spin PWG presentation - we need to be sure what we want
        2. big issues for W x-section : sufficient accuracy of BTOW calib, need for new simu w/o embedding, need for embedding request
        3. Z x-section will require lot of new work (Z-alog, effi) - what are benefits/cost of this extra work
  1. Future: projections of W AL sensitivity at mid & forward rapidity
    1. Bernd's plan
    2. Jan's execution (if I make it on time today)
  2. AOB

February 23, 2010

Agenda:

  1. plans for 2 W publications: Bernd
  2. Draft of figures for W AL paper
  3. Draft of figures for W x-section paper : ADD HERE
  4. AOB

APS @ Washington: final version of all talks

(1) B. Surrow: Introductionhttp://web.mit.edu/rhic-spin/surrow/talks/2009/B.Surrow_APS_W_Talk_1.pdf
(2) J. Stevens: Cross-sectionhttp://web.mit.edu/rhic-spin/surrow/talks/2009/J.Stevens_APS_W_Talk_2.pdf
(3) J. Balewski: Asymmetryhttp://web.mit.edu/rhic-spin/surrow/talks/2009/J.Balewski_APS_W_Talk_3.pdf

February 9, 2010

Agenda:

  1. Final (but not approved, so we can still change them ) talks for APS:
  2. Joe - PDFs, PDFs, PDFs and not a drop to drink
  3.  

February 2, 2010

Present: Justin, Ilya, Scott, Hal, Rosi, Bernd, Joe, Jan, Ross, Gene
Focus on APS related issues

W analysis:

Orders of talks at APS:
Session X11: Mini-Symposium: Recent Results from RHIC II

Session D7: Soft and Hard Interactions at RHIC
Tai talk ...
Ross talk PDF, abstract

January 26, 2010

Agenda:
Focus on APS related issues

  1. Ross: absolute x-section BHT3=481 +/- 10 (stat) nb +/- 23% , LT for all good pp500 run. Is finished Table per run (ver 4a), writeup . Comments?
  2. W x-section: Joe, Justin
  3. AL - Jan : AL formulas, data analysis
  4. Theory (CTEQ5M) + pol-models, Bernd - blog 1
  5. QA of rcf M-C : ETOW/BTOW reco energy - Ilya  TPC dead padrows - Justin
  6. AOB

January 19, 2010

Present: Hal, Scot, Bernd, Joe, Ross, Jan, Ilya
Focus on APS related issues

  1. Ross
  2. Justin (assuming Luminosity from setABCD = ~12 pb^-1)
  3. 'test3' W Monte-Carlo
  4. Bernd:
  5. W-cuts tuning (Jan): TPC sector variation, PDF
  6. Joe - Background subtraction systematic - See email for now. Will put it in blog after dicussion.

Post APS
Reconstruction of W kinematics Jan's blog

Announcements
Ilya setup Drupal 'master' page pointing to MIT-Wiki

January 12, 2010

Present: Ross, Ilya, Justin,Jan,Scott

January 5, 2010

Phone bridge number: 617-452-2163 , time 5pm to 6+pm ,
Agenda

  1. SL09g production: ~done
  2. xSection: Ross - integrated lumi per run
  3. embedding: pilot 500 e+,e- done, Who is doing QA, what to QA
  4. theory calculation: Bernd
  5. pure simu request: submitted by Jim, status ?
  6. plan of tasks before APS - Joe
  7. upgrade of W-algo
  8. upgrade of Z-algo

year=2009

  1. realistic plan for results to be shown at APS, calendar
  2. TPC calibration
  3. BTOW calibration
  4. W-xsection
  5. M-C - when E+B geometry is closed & SF matched
  6. Embedding readiness
  7. AOB

December 8

Agenda

  1. W production priority: Bedanga - we are #1
  2. Code readiness : Jerome 'new'=SL09g was assembled on Monday
  3. Data production readines based on 1/7 of data produced in dev=SL09g
  4. Embedding readiness - Pibero
  5. W x-section: Ross
  6. AOB

December 1

  1. Code readiness
    On November 23 "we created stable SL09f library with all codes from current DEV up-to-date to proceed with calibrations production"
    Shall we use this library as basic platform for:
  2. Embedding readiness
  3. Data production readines
  4. BTOW 2x2 vs. 3x3 cluster energy - Ilya
  5. vernier scan, W x-section: Ross
  6. reco Z events invariant mass and charge sign discrimination- Ross
  7. AOB

Announcements

November 24

Minutes
Present: Ross,Joe,Hal,Justin,Scot,Gene

  1. TPC calib:
  2. embedding preparations
  3. ETOW: SF=0.05 and LOW_EM option will be used in future simu
  4. Comments/reflections after RSC meeting @ Berkeley : talks
  5. AOB
  6. Announcements:

November 17

Present: Pibero,Hal, Bernd, Joe, Ross, Jan, Scott, Ilya, Justin, Gene

  1. TPC calib: SC &GL - not there yet
  2. Update on embedding readiness - Pibero slides
  3. EMC data vs. M-C compatibility (pre-embedding test) - Justin
  4. BEMC sampling fraction study - Ilya blog
  5. closing of the Endcap geometry - Ilya, 2 words update
  6. Comments on Bernd's W-presentation at RSC meeting at LBL talk

November 10

Present: Justin, Ilya, Scott, Will, Joe, Jan, Ross, Bernd

  1. TPC calib: Joe reported nothing works, code & DB content is in flux
  2. closing Endcap geometry - Ilya, 1 sentence update : not there
  3. BEMC sampling fraction, Ilya: BEMC s.f. and clustering
    Decided to use only LOW_EM option, study SF vs. eta and ET
  4. W xSection formula- Ross


  1. LO interpretation of AL at mid rapidity - Bernd
  2. Presentation(s) for RSC meeting at LBL

November 3

Present: Rosi,Ross,Will,Joe,Jan,Ilya,Scott,Justin

  1. PPV , Rosi, solution to CMB problem - great job! PPV upsdate , code in CVS 4 days later. This problem is definitely solved.
  2. TPC calib: Joe
  3. closing Endcap geometry - Ilya - not there yet
  4. embedding request: was approved by spin PWG,
  5. status of pythia-filtering - work is ongoing
  6. Generation of M-C events w/ 2009 geometry (efficiency, embedding)
  7. BTOW calibration: Joe + Matt
  8. Study of BTOW SF Ilya, Mike
  9. progress on W->Jet+Jet+X channel - few lose remarks were made, mostly suggesting it is not worth the effort. I still think it is worth to try, some day.
  10. AOB

    October 27

Present: Justin, Joe, Ross, Will,Gene, Scott, Ilya,

  1. W-analysis plan shown to PWGC by Bernd
  2. Embedding plan - Jan, procedural steps:
    a) Present the same task list for completeness in tomorrows software meeting : Jan
    b) Present a brief update of this during the SPIN PWG meeting, in particular a statement about the question for embedding
  3. TPC calib (Gene, Joe): T0 loaded to Db, SC calibration started
  4. BTOW calib (Joe) : ~60 towers w/ mixed fibers will be masked as dead, not sure when all is uploaded to DB
  5. Ross , eta dependence of non-gaussianity
  6. Justin, Scott  Kinematics Transvers Mass

October 26 , special meeting to discuss Bernd's task list

Present:Gene, Bernd, Joe, Jan, Rosi,Justin, Ilya
Minutes

Bernd reported from the private meeting w/ Jerome. There is general good, common understanding of priorities.
From the list of 'red items' on Bernd's list 2 are problematic:

Rosi confirmed the T0 fix did not helped in restoring CMB tracks in PPV. She will try to investigate it further, but asked for new ideas. So far nothing is wrong. It was not confirmed CMB tracks are missing also for M-C events. This item has no ETA.

Joe & Matt realized the mip-less towers w/ good slope have either wide pedestal, or low gain, or unstable HV, or all of the above (the spectra and detailed rapport will be posted). All such towers will have offline gains determined from the slopes (are restored). Now we will have only ~100 dead towers in BTOW. List of those will be posted on emc2-hn , so there is a record, perhaps some can be repaired before the run. No evidence of the elusive towers with mixed fibers. This item is declared to be resolved.

Gene reported T0 fix is in DB. Today Joe can start working on SC & GL calibration. ETA 1 week, perhaps longer. The 'stop condition' is achieved residuals in sDCA below 0.3mm.

Revelation: once SC & GL are in DB, Jan need to run pilot production so Rosi can re-examine beam line constrain and upload those to DB. Total ETA ~3 days.

Ross prepared his (& my) first guess of systematic errors contributing to the Xsection, see last item below.
For now the outstanding item (20%) is due to the gauss shape? used in the V-scan fit. We need more details (plots, comparisons) to discuss it.

Embedding - using it would address several uncertainties at once:

  1. loss of true Ws due to pileup tracks or EMC hits in either of the veto-cones
  2. in particular beam-background tracks affect veto in the Endcap
  3. amount of contamination to reco Ws due to accidental pileup track pointing to trigger pi0 cluster
  4. contamination due to non-collision trigger messing up lumi calculation
  5. loss of track efficiency due to removed clusters tagged on-line as deconvoluted, here beam background also plays the role

Significant time was spent arguing w/o concrete arguments:

Material used during discussion

  1. Bernd (obsolete now) analysis task list is at:http://drupal.star.bnl.gov/STAR/system/files/W-analysis-tasks.pdf
  2. Carl's arguments for embedding:http://www.star.bnl.gov/HyperNews-star/protected/get/starspin/3953/2/1/1.html
  3. Pibero's embedding request for pp200 data , run 9http://www.star.bnl.gov/protected/spin/pibero/dijets/2009.10.23/embedding.html
  4. 'OLD' embedding requests in the queue: http://drupal.star.bnl.gov/STAR/comp/embedding/operations/old-requests
  5. Procedure of requesting embedding, as described by Renee (the Embedding team leader)http://www.star.bnl.gov/HyperNews-star/get/embedding/658/1/1.html
  6. access to ZB events for many run in pp500 is painful, often there is no separate event stream:http://www.star.bnl.gov/HyperNews-star/protected/get/rts/298/1/1.html
  7. Ross: sources of systematic error for W X-section

October 20

Present: Bernd, Jan, Ross, Will, Scott, Justin, Ilya
Minutes

  1. Vernier scan analysis, trying to reconcile fast and vernier cross sections through z dependence - Ross
    Understanding of discrepancy between ZDC vs. BHT3 may require a trip to BNL, but for next week we should expect 1st estimation of W Xsection from run 9 data with detailed table of all systematic errors.
  2. Update on Transverse Mass Reconstruction - Justin  blog
    After code fix rec transverse mass for M-C (fig 5) and data (fig 7) look more alike
    Fig 6 shows prospects of reco longitudinal momentum for Ws , today for M-C, will be tried w/ run 9 data soon
  3. AL for W-> di-jet, P.Nadolski predictions for LP^2 FOM=80/pb : PDF page 30
    UA2: L=0.7/pb, sqrt(s)=630 GeV, p+pbar : see W yield on PDF page 17.
    Q: compare seen # of Ws for UA2 vs. expectation for STAR run 9.
  4. Bernd - Latex paper new deadline : Monday, October 26 for Jan, Scott,Ross, Bernd
  5. Jan - update on deploying STAR software on Amazon Compute Cloud (EC2) , first bill
  6. Postponed for next week
  7. Announcements

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 sqrt(s) = 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