The STAR experiment

PWG: BulkCorr

PAs:  Declan Keane, Subhash Singha

Targeted Journal : Phys. Rev. Lett.
Proposal page: https://drupal.star.bnl.gov/STAR/blog/subhash/paper-proposal-observation-global-spin-alignment-k0-vector-mesons-auau-collisions-using
Analysis note: https://drupal.star.bnl.gov/STAR/system/files/AnalysisNote_ver1.pdf
Paper draft: https://drupal.star.bnl.gov/STAR/system/files/draft_Kstar_alignment_ver1.pdf
 

Examples:  1. event generator + zerobias embedding

                  2. large sample of multiparticle embedding for high moment analysis (do we need this for each BES-II dataset?)

Conclusion: 
- SPIN: will continue the normal practice of zerobias embedding. Run13 part 2 and Run17 will come soon.
- JetCorr: the zerobias embedding in p+p collisions was very helpful, which prompted the later requests for p+Au and Au+Au. Will check whether a similar request for d+Au is needed. Will bring to PWG for discussion.
- HF: not aware of any zerobias embedding besides what have been submitted (Run16 d+Au, Run17 p+p). Will bring to PWG for discussion.
- BulkCorr: will need at least 1-2 BES-II energies for multiparticle embedding. Hopefully will have a better idea soon.

 

4) CVS->Git: S&C infrastructure group proposes to switch from CVS->Git for STAR offline software. While the detail plan is being worked out, comments/inputs from general users about this movement are welcome. 

Conclusion: 
- Conveners expressed welcome to this idea, and suggested to move other parts, such as paper code, besides offline software to Git as well
- Matt brought up a suggestion of archiving code for preliminary results, which will probably need some fundamental changes to the current practice. Will continue this discussion in the future.

5) Production plan before next PAC meeting (Sep. 11th)
- Once Isobar phase-II is completed, we will begin Run17 pp 510 GeV st_W (small dataset), and then st_physics (what fraction of data is needed to show Preliminary results?)
- We probably need to produce at least 19.6 GeV collision data. Shall we pause other productions once the calibration is ready?

Conclusion: 
- SPIN: will bring the discussion to PWG to find out the minimum fraction of st_physics data needed to carry out calibration and release preliminary results for PAC meeting
- Dan reminded us that Run20 31.2 FXT is also of high priority and should be produced before PAC meeting. Will discuss how to distribute resources when calibrations for these datasets are ready.

6) PWGC preview templates: TEMPLATE

Conclusion: no further comments to the template and will announce it to the collaboration.

7) Significant figures for data tables on HepData. What is STAR policy? SLIDES

Conclusion: conveners unanimously agree that we should upload data to HepData with scientifically meaningful significant digits. Will announce the guidance to the collaboration.

8) How to deal with updated alpha value by PDG for our Lambda polarization paper
- Proposal: create new versions of these figures using the updated alpha value, and put them on STAR webpage. Maybe put the alpha value used in these figures to make sure new versions are used from now on. No erratum needed. 

Conclusion: conveners agree with the proposed approach. Carl brought up that there could be 3-4 SPIN papers for which the figures also need updates. Takafumi will coordinate with conveners and PAs to produce updated figures and check whether physics messages are affected or not.

9) Clean up old/obsolete presentations: WEBPAGE