June  14, 2011

Phone bridge : number 617-324-7520 , time 5:00 pm to 6:30pm

Agenda:  

  1. Run 9 Production blog  - Justin
  2. Theory Calcs Appearing as Completed (link) - Joe

June  7, 2011

Phone bridge : number 617-324-7374 , time 5:00 pm to 6:30pm

Agenda:  

  1. Run 9 Production - Joe/Justin
  2. Run 9 SN v1.2 - Justin
  3. Run 9 Paper - Joe
    1. Draft Figures - blog
  4.  

AOB:

    Draft Users Meeting Talk - Justin

April  19, 2011

Phone bridge : number 617-452-2163 , time 5:00 pm to 6:30pm

Agenda:  

  1. Run 11 - What did we get? - Jan
  2. Run 9 reproduction/embedding - Joe/Justin 
  3. AOB

March  22, 2011

Phone bridge : number 617-324-7374, time 5:00 pm to 6:30pm , 10 lines

present: Bernd,Jan,Pibero,Justin,Evan,Anselm, Scott,Gene

Agenda:  

  1. Prospects of physics outcome from run 11 Ws.  
    1. W AN   theory prediction, sensitivity - Justin , An is large  (and changes sign) at the ET of half of W mass, where we run rapidly out of yield.  
    2. FOM for AN w/ run 11 stats - Jan , 500 events would allow to measure AN*P with accuracy of 0.06 (=1 sigma)
    3. Ws in the Endcap?
  2. Run 9 W x-section  paper ?
    1. is paper really done and we await for efficiency from embedding?
    2. STAR library with fixes is not tagged yet, we want to use it for re-production and new embedding
    3. Dmitry improved DB so may be Justin will be able to run all jobs at once.
  3. RUN 12 BUR (Mid-rapidity / Forward rapidity) Expected LT, P as in run 11. We need achievable physics goal measurement.
  4. AOB

March  8, 2011

Phone bridge : number 617-452-2163, time 5:00 pm to 6:30pm , 10 lines

present: 

Agenda:  

  1. Update on SL09g/SL10j comparison - Joe
    1. Change in DB that causes loss of tracks is found - link
    2. What do we want to do now? Reproduce? Both production and embedding? Can we use cloud?
  2. Update on W Embedding - Justin
    1. W- : done  movie
    2. W+: done  movie
    3. Z->ee : done
    4. W->tau : few days left
  3. AOB

March  1, 2011

Phone bridge : number 617-452-2163, time 5:00 pm to 6:30pm , 10 lines

present: 

Agenda:  

  1. Update on SL09g/SL10j comparison - Joe
    1. One line of code causes a problem 
    2. But its not the whole story
  2. Update on W Embedding - Justin
  3. AOB

February  22, 2011

Phone bridge : number 617-324-7520, time 5:00 pm to 6:30pm , 10 lines

present: 

Agenda:  

  1.  Update on SL09g/SL10j comparison - Joe
  2. First 100 Ws @ STAR reconstructed  on the Cloud - Jan + Justin + STAR & Magellan Computing teams
    1. Movies W in BEMC , one Z in BEMC

February  15, 2011

Phone bridge : number 617-324-7520, time 5:00 pm to 6:30pm , 10 lines

present: Justin, Hal, Joe, Scott, Evan, Gene, Jan

Agenda:  

  1.  Status of TPC calib: Gene, Joe. New SC & GL in official DB as of day 46, ZDC seems to count less by ~20% 
  2. EMC status - Justin
  3. L2 malloc() problem - Joe. Is  solved 
  4. Ws in the barrel found so far page 13:  PDF , separated by day: 42 , 44 , 45 - Jan
  5. VMs processing data taken today load
  6. Idea of 'W from the Cloud' daily updating page ? Cons seems to weight over pros.
  7.  long vs. trans switch - change of plans?
  8. ongoing data related tasks to be taken, as shown last week drupal blog^http://drupal.star.bnl.gov/STAR/node/20243/ , Evan will start working on bXing offset vs. run.
  1. AOB

February  8, 2011

Phone bridge : number 617-452-5208  , time 5:30 pm (30 minutes later)  to 6:30pm , 10 lines

present: Gene, Justin, Scott, jan

Agenda:  focus on run 11 Ws; goal AL paper in reading by spin PWG in the Fall'11:

  1. Identified tasks: http://drupal.star.bnl.gov/STAR/node/20243/ - Jan
  2. Status of TPC calibration + beam line constrain - Gene## preliminary in place: T0, TPC gain by Tonko online follow ramp with some latency, DV, beam line, SC & GL taken form run 9 pp500## work on better : beam line, big task SC & GL  following Joe's work w/ ZDC rate as input - needs evaluation, are ZDC the same?## Lower HV to 1100 V  TPC gain will reduce by 30%, MIP should be still visible, efficiency should not deteriorate## gains between pads needs to be redone with new HV## low lumi fill wil be request   
  3. Status of EMC calibration - Justin
  4. Status of production on VM - Jan#* resources:  cores, local disk, permanent disk - sufficient  
    • protocol: not fully functional
      • Works: automatic writing daq files from RCF HPSS to rcf data13/, processing of single daq file on VM including I/O to host (carver)
      • in commissioning : reliable DB update on VM, bulk file transfer to NERSC w/ gsiftp
      • on the drawing board: transporting muDst back to RCF, sinking in HPSS, registering muDst with the file catalog
  1. Status of 2011 W-algo , E+B, W, Z - Justin## writes W-tree, ## Endcap W-code: needs track & cluster## Endcap Z-code : 1 track & cluster in B + cluster in E (no need for  track)
  2. Analysis of day 37 - Jan: W-barrel 'movie' for run 12037063
    # AOB

January 18, 2011

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

Agenda:

  1. Status of embedding request - Jan, Justin
  2. New Production - Justin, Jan, Gene
  3. [W Xsec Paper|http://drupal.star.bnl.gov/STAR/blog/seelej/2010/oct/26/run9-w-cross-section-paper] - Joe
  4. [W Xsec Analysis Update|http://drupal.star.bnl.gov/STAR/system/files/xSectionUpdate1.18.11.pdf] - Justin
  5. AOB

January 11, 2011

Phone bridge : number 617-324-7374 , time 5pm to 6:30pm , 10 lines

Present:
Agenda:

  1. Status of embedding request - Jan, Justin
  2. New production - Justin
  3. Paper Rough Draft Released - Joe
  4. AOB

January 4, 2011

Phone bridge : number 617-324-7374, time 5pm to 6:30pm , 10 lines

Present:
Agenda:

  1. Status of embedding request - Jan eval of muDst, Justin
  2. New production - Justin
  3. Paper Status - Joe
  4. SN Status - Justin
  5. AOB## ESMD/EPRS ideas for Endcap W algo - Justin blog

December 14, 2010

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

Present:
Agenda:

  1. Status of embedding request - Jan, Justin
  2. Run11 Prep - All
  3. W kin

December 8, 2010

Phone bridge : number 617-324-7374, time 5pm to 6:30pm , 10 lines

Present:
Agenda:

  1. Status of papers from run 9
    1. W AL
    2. W x-section
      1. paper draft
      2. embedding
  2. Preparation to run 11, pp500
    1. Goals 
      1. acquire LT=100/pb w/ P=50% to tape (is ~20% higher than in BUR, lets balance pressure from IP3)  
      2. plot J-peak charge separated 1 month after W-trigger established
      3. determine AL for W+,-  in the Barrel and Endcap 
      4. publish only AL for W+,- 
      5. do not yield to the pressure of upcoming conferences, rather do the job once and do it right at the first time.
    2. timing in of calos & spin bits 
    3. L0 trigger
    4. L2 tagger 
    5. online monitoring
    6. human run QA concurrent with data taking
      1. revise key words describing problems
      2. generate automatic run list (the big CSV table)
      3. assign names & weeks for human QA, define stick and carrot
    7. preparation to daq files production :  ###  A='dirty' , B='preliminary', C='final'  (w/ support from Jerome)   
      1. time line:  A='near real time', B='end of May' , C='December 2011'
      2.  availability of TPC calibrations : A='2mm', B='as good as in run 9', C='final'
      3. beam line constrain
      4. availability of EMC calibrations: a) E+B towers, b) ESMD, c) anything else
      5. availability of computing resources:  Magellan/Cloud for A,B, RCF for C
      6. availability of disks for muDst :  ~50% on our institutional disks, 50% on RCF, may need to 'see' only half of muDst at given time, the rest on HPSS
      7. availability of manpower to harness the cloud:  Matt,Jan, Iwona(10%), Justin, Jerome is helping a lot
    8. do we need changes/upgrades to the BFC to better utilize Endcap info for tracking? 
    9. Low priority issues (work on those after all the above is in a good shape)
      1. Z-> ee x-section
      2. W A_N from the transverse period , theory talk @ RIKEN https://indico.bnl.gov/materialDisplay.py?contribId=14&sessionId=6&materialId=slides&confId=247
      3.  dbar/ubar from unpol Ws
      4. ZB events & embedding
      5. vernier scan

December 1, 2010

Phone bridge : number 617-324-7374, time 5pm to 7pm , 10 lines

Present:
Agenda:

  1. [Dip problem resolved?|http://drupal.star.bnl.gov/STAR/blog/seelej/2010/nov/23/a-resolution-dip-problem-pp500] - Joe
    # [First look at endcap Ws|http://www.star.bnl.gov/protected/spin/stevens4/tmp/nov22/endcapW.pdf] - Justin
    # Embedding and Production Update - All
    # [more about Endcap Ws |http://drupal.star.bnl.gov/STAR/system/files/2009-W-Endcap-varia1.pdf]h4. November 9, 2010

Phone bridge : number 617-324-7374, time 5pm to 7pm , 10 lines

Present:
Agenda:

  1. Paper has been resubmitted!
  2. TPC Calibration - Done! - Joe
  3.  

October 26, 2010

Phone bridge : number 617-324-7374, time 5pm to 7pm , 10 lines
Present:
Agenda:

  1. GPC comments/resubmission to PRL of AL paper  - Bernd
  2. TPC Calibration - Joe
  3. Xsec paper figures - Joe, Scott, Justin
  4. BTOW scale decision - All
  5. AOB
    1. vernier scan note and luminosity numbers posted - Ross

October 19, 2010

Present:

Agenda:

  1. GPC comments/resubmission to PRL of AL paper  - Bernd
  2. BTOW Scale update - Justin
  3. will BSMD help in W reco? - Jan 
  4. Preparation for run11 - Joe
  5. Luminosity Monitoring for run11 - Ross
  6. AOB
    1. Draft DNP talk - Justin

October 12, 2010

Present:
Agenda:

  1. Referee Responses to AL paper  - Bernd
  2. Our first *real* citation  
  3. Ready to start embedding? - Jan, Joe, Justin
  4. Vernier scan note/systematics - Ross 

October 5, 2010

Present:
Agenda:

  1. Referee Responses to AL paper  - Bernd
  2. Update on investigation of BTOW scale: blog

September 14, 2010

Present:
Agenda:

  1.  W x-section paper
    1. Investigating BTOW scale:  E/p stuff  another idea

August 24, 2010

Present:
Agenda:

  1. W AL paper: corrections to Fig3 : Appendix G with yields , full SN ver 2.48
  2. W x-section paper (Table of tasks)
    1. Transverse Shower Leakage: Justin
    2. Renne expects official W-embedding request from spin PWG
  3. AOB

August 17, 2010

Present: Justin, Rosi, Jan, Gene, Joe, Ross
Agenda:

  1. W x-section paper (Table of tasks)
    1. Pythia simu : done, see table (Jan)
    2. absolute lumi, Ross
    3. BTOW Longitudinal Leakage: Justin
    4. add more ...
  2. AOB
  3. Announcements:
    1. W AL paper posted at RHIC, intended submission to PRL : August 23, 2010. Elapsed analysis time between end of data taking (April 13,2009) and submission to PRL will be 16.5 months. Lets do better for run 11 (smile)
    2. Joe is back

August 10, 2010

Present:Justin,Rosi, Ross, Bernd,Scott, Hal, Jan
Agenda:

  1. W AL paper, Bernd, ver 3.0
    most of comments from STAR collaboration were addressed, ready to sent to GPC again
  2. W x-section paper
    1. absolute lumi, Ross
      attempted new approach to estimate systematic error due to non-gaussianity, not converging yet, not sure if it ever will. Another idea of using deviation of chi2/dof from 1 as measure of syst error is investigated. The final table of integrated lumi per run (ver 4f) is attached to the drupal page.
    2. M-C simu: Justin, Jan
      EEss in dev, Lidia will tag it soon. Jan: pilot 1K even per sample will follow, with fixed single time stamp. Justin is working evaluation if EEss works properly.
    3. preliminary paper outline / motivation issues: Scott
      need to make decision soon if pol analysis are described in this paper.
    4. preliminary SN outline: Justin
    5. Willie resumed work on absolute BSMD calib based on run 9, we talk a lot, got air pressure values from Oleksandr, plot
    6. more ...
  3. Preparation for run 11:
    1. TPC working point for pp500 in run 11 Gene
  4. AOB

August 3, 2010

Present: Bernd, Rosi, Justin, Ross, Jan
Agenda:

  1. Carl's question about tau background for paper ver 2.0
    1. Short answer: NO, "Pythia does not include spin effects", Pythia 8.4, manual page 265
    2. Simu polarized tau decay at LHC Peskin, 2007 , page 17
    3. Pythia+TAUOLA example MC-TESTER , page 9
    4. TAUOLA, 2005 can be used w/ Pythia
    5. hadronic tau decay @ LHC
  2. TPC working point for pp500 in run 11 Gene
    Questions:
    1. how do I convert the X-axis in to instantaneous luminosity?
    2. how do I convert the Y-axis in to separation between +/- charge for high pT tracks.
    3. how can I infer loss of efficiency (and reco pT degradation) due to lost not-deconvoluted clusters.
  3. more on BG(eta) from run 9 , Jan
  4. status of EEMC slow simu
  5. run 11 preparation: FOM , Jan

July 27, 2010

Present: Ross,Hal,Rosi,Justin,Scott,Jan
Agenda:

  • Task for W x-section tasks & assignments
    We went thought the task list, few milestones and dates will be added.
    Hal raised question if details of the spin analysis will be part of the x-section paper.
    Pro: if we skip it now and have AL PRL paper from run 11 the details will be never published,
    Cons: many systematic studies of AL will show up much better on expected 5x larger stats from run 11
    No decision was made
  • Evaluation of absolute BTOW calibration blog
    Scott proposed mechanism for E/P=1 for di-jet comes from jets w/ leading pi+/- converting in to pi0 in EMC - we talk ~hour about likelihood of this.
  • Next W phone will be in 2 weeks on August 10.
  • W AL paper: latest ver 2.0

Summer break

June 8, 2010

Agenda:
A) Improve communication between PAs & GPC

  1. Are all questions below understood and people working on them?
  2. Will we have written answer for GPC ready (few days) before Friday (or should we ask for one more week) ?
  3. Most of GPS questions relate to W-reco , not AL(W). Are we preparing W-reco SN or beef up existing AL AN (and likely forgo the W x-section paper ) ?
  4. Shall we remove word 'first' as advised?
  5. Below is list of questions/comments from GPC (sent on June 5, 2010):
    1. the distribution of difference between EMC cluster center and the TPC
      track for + and - tracks:
      Need to check the distributions with signed distance, and separate
      xy and z directions.
      Need to check the distributions for W+- candidates only
      The effect of the cut on this quantity is probably small in terms of
      efficiency difference between + and - candidates. But it will be good to get
      an estimated number on this.
      These distributions will provide a good quantitative measure on how
      well the TPC calibration is. Once we know the difference for + and - tracks,
      we could estimate the magnitude on possible momentum distortions for tracks.
      We can estimate the effect of this distortion in real data.
    2. the sPtBalance vs awayside-Pt figures do show that the correlation
      depends on ET of the candidates. The Pas are asked to impose an awayside-Pt
      (15 GeV/c or 20 GeV/c), and use the same procedure as the current analysis,
      to generate QCD background and W candidates.
    3. regarding the simulated STAR W-->e responses overlay with the measured
      W candidates. The Pas gave a plot where the data points are different from
      what was in the paper. It was explained that different cuts were used. Just
      looking at the figure it appears that the matching quality between W+ and W-
      is not the same. The Pas should provide the figure using the cuts and data
      points that we intend to publish.
    4. for ET>50 GeV region one table listed 6 events with bad
      gain/saturation, and the actual tables only have 5 of them. We should have a
      consistent number listed.
    5. whether we should have 'first measurement' explicitly stated in the
      title of the paper – people have different opinions. My quick glance of the
      STAR papers showed no appearance of 'First' in the title of our published
      papers although we have a number of measurements would qualify for such.
      Bedanga can correct me if I missed a paper. My own preference will be to
      agree with Ernst that it is not a STAR style to explicitly claim 'First' in
      a STAR paper.

B) Update on the W x-section analysis

  1. Absolute lumi monitor ( final table, SN)
  2. changes in the algo:
    1. consider drop sPtBalance and go back to away ET cut>10 GeV, perhaps as function of 2x2 cluster ET (see this distributions )
  3. More tracking distributions - Justin blog

June 1, 2010

Agenda:

May 18, 2010

Agenda:

  1. Ongoing data analysis
    1. Vernier Scan/Luminosity
      Q: shall we remove this 5 runs:10096139, 10096140, 10097086, 10097088,
      10097090 from the spin sorting:
    2. TPC Simulation Tickets
      • HV - uploaded?
      • East/West TPC offset : ticket not even opened
    3. Mid-rapidity tracks - Justin pdf
    4. more ....
  2. Addressing GPC Questions: Origin of the background at ET>50 GeV
    1. Jan : spectra for culprit events pdf
    2. Justin :  Old filtered QCD MC comparison pdf
    3. single events & spectra

May 11, 2010

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 ##* few plots form Jan : change J-peak shape , add Q/PT cut
    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
    • PRL: W+/- Asymmetry presentation (responsible: Bernd / Jan)
      W* PRD: W Analysis details / algorithm and cross-sections (responsible:Joe / Scott )
      *The plan *:
      a) Agree on a detailed outline together with figures / figure types : Deadline 03/02/10
      b) Develop a clear task list for both analyses : Deadline 03/02/10
      c) Presentation to SPIN PWG of overall plan (Requires items a) and b)) : 03/04/10
      d) Prepare two separate PN along with completion of tasks
      e) Prepare two solid paper drafts
      f) Paper proposal presentation to SPIN PWG with PN and paper drafts followed by GPC requests
  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:

  • data/MC comparison : Joe PDF....
  • AOB

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:
    • theory calculation blog
    • QAed polarization per fill blog
  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

  • computing absolute lumi and W xSection. I think it is time to just do it , show, criticize, do it again.
    -newer table of luminosity
    -first look at efficiencies blog
  • theory calculation - lets start to plot it on the xSection
  • QA of non-embedding M-C: ilya drupal
  • update on fill polarization - are we waiting on new values or just on the summary table from Bernd

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
    • using of jet finder blog
    • add isolation cut on TPC tracks around electron tracks
  8. upgrade of Z-algo

year=2009

  1. realistic plan for results to be shown at APS, calendar
    • INPUT:
      • which run 9 muDst (SL09b or SL09g)
      • which M-C events (no private files)
      • any embedding
      • theory calculation
    • OUTPUT: 'preliminary' or 'final'
      • W x-section
      • AL(W+), AL(W-)
      • Z mass, x-section
    • WORK assignment - will be updated
  2. TPC calibration
    • SC & GL
    • beam line
  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
    • muDst at: /star/data05/scratch/balewski/2009-muDst-beamLine3/, BFC="pp2009c ITTF VFPPVnoCTB BEmcChkStat beamLine Corr4 OSpaceZ2 OGridLeak3D -dstout -evout", ready for evaluation
    • PPV QA : Rosi#** beam line : Rosi
    • TPC calib - Joe, Gene, Jan
      • chi2/dof, Q/PT from SL09g Jan's blog
      • SC &GL - After pileup reduction - Still systematic problems - Developing new method to deal with it.
        • dedx
    • QA BTOW, ETOW, TRG response in dev  - Justin's blog
  4. Embedding readiness - Pibero
    • TPC: position corrections for mixed clusters, chi2/dof, dedx - Gene
    • summary of convergence about SF & LOW_EM - Matt
    • are ETOW gains 'ofl' ?
    • BTOW+ETOW gain data/mc - Justin follow up blog
    • Ilya - update
    • pilot W-embedding request of single high energy electrons details - not in execution
      • goals: 
        * test how beam line offset used by GSTAR is changed from fill to fill,
* test how multiple use of the same ZB events is handled (different M-C seed, different output file name)
* test the ZB event time stamp, event ID, run # is preserved
* test proper gains for BTOW & ETOW are used
* test reco electron energy agrees w/ thrown energy
* test chi2/dof for tracks is reasonable
* test dedx is reasonable
* test raw ADC for all BTOW & ETOW towers are stored in muDst
* test correlation between .geant and muDst events
* test timing , disk space
  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:
    • new production of W-daq files
    • generation of M-C events for W-embedding
    • W-embedding itself
  2. Embedding readiness
    • weights for ZB events - Jan's blog
    • official description of the W-embedding process in drupal
    • how will it all work together? Pibero
    • BTOW SF & LOW_EM in simulator: Matt.
      Recent plot from Mike 50 GeV ET gamma . Magenta dots show the most likely GSTAR output, black line shows current value of the SF(eta) used in the barrel simulator. If simultor is used 'as is' the reco ET will be off by up to 5%. (plot taken from Mike's blog)
    • pre-embedding comparison of BTOW, ETOW response - Justin blog
  3. Data production readines
    • TPC calib, Joe, Gene
    • when STAR libary will be tagged?
  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

  • Rosi: Previous beamline values are in Drupa blog
  • Beam line code is cvs-ed StRoot/StGenericVertexMaker/macros
    Added Files: UtilBeamLine3D.cxx likeFuncBeamLine3D.cxx mainFitBeamLine3D.cxx
  • BTOW pp500 gains are uploaded to DB w/ 'ofl' flavor Matt's e-mail

November 24

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

  1. TPC calib:
    • SC &GL - results expected on Nov 25 - failed
    • dE/dX, track chi2/dof for data - BFC production requested over weekend
  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#* suggested sequence of W-embedding steps
    • do we need plan C: give up on tuning of TPX slow simu, multiply dedx by 2.6, live with the chi2 mismatch (factor 1.5)
  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
    • evaluation of chi2/track for M-C & data, Justin blog - many areas of disagreement
  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#* new plots from old data replay, no spin info: PDF-1#*# Zs: inv mass, phi1 vs, phi 2

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)
    • shall we go privately with production
    • shall we pay for it to Amazon (how to find $5-10K ?)
  7. BTOW calibration: Joe + Matt
    • absolute gains from ideal gains * slope ratio * E/P correction were computed and uploaded to DB w/ the flavor 'Wbose2'. More details here
  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:

  • implementing deconvolution code would take months in real time , during meeting we have agreed to descope this item
  • commissioning of MC filter. Jerome plans to personally review the code, not sure when it may happen. Jan made suggestion to delegate this task.
  • ETOW geom is ~done for Jerome. However Ilya confirmed it is 'not right' for IUCF. the new SF=4.7% changes by 6% in the wrong direction if XXX? is changed in geometry. A week+ is needed to resolve it.

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:

  • one could approximate X by Y, but not sure how accurate will it be done, vs.
  • I want either embedding or deconvolution, because I do not trust anything else
    This is representative to expected discussion on a broader forum and affected my suggestion how to proceed.

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
    • TPC - status of calibration
    • TPC - status of handling of deconvoluted hits by Sti
    • PPV - understanding of missing CMB tracks
    • BTOW absolute calibration: mip-less & slop-less towers
  7. Announcements
    • Ilya (IUCF) signed-on for W2009-mailing list

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
    • when can we replay data for one fill?
  3. BTOW calibration
    • relative are done, or ? (smile) - Joe
    • absolute : E/P using slopes & ideal gains - Matt
  4. W analysis
    • Joe - updates? Close to final version to be shown on Thursday.
    • Justin -
  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
    • Ws from Phenix

      Ws from Phinix

      phenix - W+ W-
  9. Announcements
    • Hal finished run QA for fills: 10383,10389,10399, 10402. We are done!

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
    • formula computing BBC xsection seems to be complete now. For a low lumi fill in pp500 the computed BBC xsection is 26mb - close to the value know for pp200
    • Q: what do we expect for BBC xsection at 500 GeV - answer is unknown
    • the linear formula can't be applied for regular fills when BBC is saturated, Hal suggested using more advanced approach counting bXings w/o rate, using zero of Poisson distribution. LINK SHOULD BE HERE
    • BHT3 x-section : results of fit with noisy patches removed Conclusion: background reduces but not vanishes. Comparison for other vernier scan will be made, estimation of error in determination of xSection due to non vanishing background will be made
  4. BTOW calibration
    • relative -Joe - link , is completed. Write-up was sent to emc2-hn for comments.
    • absolute -Matt, will be performed shortly using Joe's relative gains.
  5. Understanding QCD e+/e- ratio at ET [15,20] GeV - Scott.
    • Plan: use Pythia events and simplified W-algo to determine the ratio of high pT particles with positive/negative charge.
    • Manpower: not assigned.
  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:
    • Bernd will oversee the latex files, complete version will be posted in spin/protected/ area at THIS LOCATION
    • Assigned chapters: Intro+RHIC : Bernd; STAR : Scott; Lumi : Ross; Trigger : Jan
    • We hope to have them written by next week.
  8. Announcements
    • Hal finished run QA for fills: 10403, 10404, 10407, 10412.

September 8, 2009

Present: (I lost my notes, sorry)

  1. BTOW final 5% calibration
    • relative Joe- expected next Monday
    • absolute Matt- after Joe
  2. TPC
    • what is new in terms of calibration - Gene ,e.g. T0(amplitude) correction
  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:
    • W+ / W- = 5 / 1 at mid-rapidity,
    • total cross-section ratio is: W+ / W- = 3 / 1.
    • At forward-rapidity, the ratio is: 1.8 / 1
  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 #### histogram-based dump of selected events #### Larger collections of events: di-jets , W-candidates , Z-candidates #### Matt's 3 interactive events in skechup or just one view , at Scott's angle #### 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
    • 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

August 20, 2009

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

  1. Production status
    • pilot production has been QAed . No major problems were found and Lidia is most likely executing production now.
    • expect St-W muDst to be ready in few days.
    • identified problems to be fixed before next production
      • explain why PPV sees no tracks crossing TPC CM
      • why 7-bit bXing has no abort gap for the fill on page 19 top plot ?
  2. ETOW absolute calibration to compensate for incorrect TCD phase used during data taking. Two alternative methods are used:
    • Justin is comparing ratio of slopes for correct & incorrect TCD phase from regular minB events from pp200 data:http://drupal.star.bnl.gov/STAR/blog/stevens4/2009/aug/05/run-9-eemc-tcd-phase-and-effective-gains
      Fig 1.1 show example for 1 tower
      Link http://drupal.star.bnl.gov/STAR/system/files/ETOW_SlopeSet0vSet1234.pdf
      shows slopes (top) and the deduced gain correction (bottom) for all towers and all crates.
    • Scott is analyzing slopes from calibration pp500 data taken and various TCD phases and predicts similar gain correction for the TCD phase value used during W-data taking. The comparison is here
      In particular pages 4-6 show error bars. Both methods lead to the same gain correction.
    • The plan is to compute weighted average gain correction and upload it to DB with a different flavor. So user will get non-sense gains for the default 'ofl' and needs to request those. (Very good plan, Jan)
  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:
    • TPC alignment used now is old, from run 8
    • Joe produced non-linear SC based on 10 runs , not yet in DB.
    • Units for SC are V/cm^2. Conversion to actual correction used to shift clusters is SC of 0.01 V/cm^2 --> 8.5mm of shift in the X-Y plane for track at eta=0.
    • Few days later Joe generated SC ver 2 based on ~60 runs and differences between SC ver 1 & ver 2 are of 2 mm at the highest ZDC rate of ~170 kHz
    • we need to check if after applying SC the residua are scattered around zero, using different runs
    • Gene will evaluate DCA to the vertex to see if we achieved 2mm accuracy of global tracking
    • Jan investigated chi2/dof for tracking (before SC were applied) and found its average is of 1.5. We discussed how to rescale TPC hit errors to get avr chi2/dof=1.<br> There are 3 critical parameters deciding how big are errors of clusters: *dip angle, * crossing angle, and *track momentum(?not sure?) <br> Few days later Jan check chi2/dof w/ Sc and it was much closer to 1 - perhaps rescaling of hit errors is not necessary.
  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:
    • we want to run over 1.4M of L2W events vs. ~900 M of all events taken in run 9
    • Joe will give presentation motivating this production to PWGC
      #*Before we start production following must happen: <br>- confirmation non-linear SC does improve TPC accuracy<br> - mean chi2/dof should be ~1 <br> - beam line algo by Rosi, Jan must be developed, tested, vetted <br>- beam line algo must be executed over full pp 500 data set and beam line params loaded to Db<br>- problem w/ ADC=0 for ETOW for certain runs needs to be resolved , Ross reminded me it was discovered already in the past, if # of corrupted 'sth' was >40 the whole block was set to 0 - need half day of attention <br>- run list needs to be generated, including sub-list of daq files for the 5% sample-production - this is half day of my work
  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:
    • non-linear SC(lumi) should provide TPC track accuracy of 2 mm at both ends of the track. We hope Joe will work on this next week, should take a week.
    • We could also use Gene's PCA method of finding a linear combination of scalers (each at first order).
    • since linear SC(lumi) was tuned to lumi equivalent to ZDC base rate of 70kHz, any pp500 run taken at the ZDC rate has current best TPC calibration. Jan: I'll use it for beam line constrain study, see below.
    • beam line constrain : plan A is Rosi & Jan succeed with 3D beam line fit to global tracks w/o intermediate vertex finding. Here are [Media:Beamline-v3.pdf ] as intended and not implemented. If this works Gene needs a ~day to produce beam line constrain for all 39 fills. Plane B is to use Minuit vertex finder which may require significant stats to overcome jitter due to pileup tracks. In such case we would need to provide manpower for ~week long job, Gene would only supervise it. Jan: lets go for plan A.
    • conclusion: once both items are resolved we can ask for production, perhaps 2 weeks from now.
  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] and spectra [Media:BSMD-strips-Picture 15.png ]. 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 . <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:

  • Joe/Gene - TPC calibration progress, touch upon expected beam line constraint accuracy
  • Rosi/Jan - upgrade of PPV to reconstruct vertex in the transverse plane (for better beam line constraint) diagram, blog from Rosi
  • Scott/Alice (question) - ETOW calibration
  • Willie - correcting BSMD pedestal residual vs. fill , example mod 25, all 120 modules, webpage
    *Joe/Jan - production of L2W-stream could start ~June 15
  • AOB

May 14, 2009

no meeting

May 7, 2009

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

  1. TPC:
    • determination of twist & sector alignment in progress, another 10 days needed
    • times of Anode HV on/off will be uploaded to DB in a day
  2. ETOW calib:
    • few dead towers needs to be added to DB
    • slopes from timing scans will be used to determine gains for towers, once Alice will come to IUCF and work on this, in ~10 days.
  3. BTOW: pedestals and status tables uploaded to DB. BTOW status tables done & QAed
  4. Hal run QA comments , spreadsheet PPVEvalBlogPPVEvalBlog
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