The STAR experiment

2) Analysis Meeting
     - Few highlight talks + general updates for PWG sessions

2) Analysis meeting (Jan 16 - 19, 2024)

• General topics
  - Production/Calibration update
  - Embedding status
  - Centrality/Run QA report
  - Tracking uncertainty TF update
  - Progress on Phi spin alignment difference evaluations 
  - Run 22 preview production QA + forward tracking + Analysis guide 
  - Other topics, Run 24 readiness/trigger, ETOF update? 
• PWG sessions
  - COL and FXT fluctuation analyses status
  - Can call for general updates from analyzers
  - Other topics - advanced analyses/analyses in paper stage, highlights, analyses with details to be discussed more broadly etc 

2) Analysis Meeting

• Tentative dates: Jan 16 - 19 or Jan 17 - 19
• Plans to have an ETOF analysis workshop also around same time. Tentatively Jan 15-16

3) Dataset restoration request

• dAu39_production_2016 and dAu20_production_2016 in progress. Status here 
• Request from Wlodek/LFSUPC to stage Run17 rp stream? Details?

4) Embedding updates

• Test sample ready for 9.2 GeV. Need feedback from analyzers 
• Efficiency with FLUKA for energy loss in embedding was evaluated. Difference is much smaller than ALICE. 4% efficiency loss for anti-protons below pT = 0.5 GeV/c. ~2% loss till ~1 GeV (SLIDES - Ashish). No impact for net-proton fluctuation measurements (SLIDES - Yige)
• Test sample available with proton mass assumed in tracking. To investigate track splitting for heavier particles at central membrane
  Dataset here: /star/data14/GRID/NFS_FileList/production_7p3GeV_fixedTarget_2020_P23ie_protonTest_picodst.txt. Can LFSUPC/FCV/CF follow up?

5) Potential issue in data production? 

• nsigma_e distributions in new production (SL23d) more deviated from Gaussian than order production (SL21c)
• SLIDES from Wei Zhang
• Any similar observation from other PWGs?

2) CF Convener rotation

• Nu Xu will take over from Toshihiro as the new CF co-convener 

3) Tracking uncertainty task force

• The TF will prepare the codes and report + manual for general use 
• Will release recommendations for 2019 dataset, but users will be able to optimize based on pT, eta or event/centrality selections
• The TF will produce the trees with reconstructed kaons with KF particle. Users can then evaluate uncertainties for their analyses/datasets
• Currently working to get updated values with the recent embedding tune for the 2019 data and getting code and report ready

4) Run22 p+p preview production

• Mainly targeted for forward upgrade calibrations, st_fwd stream. Also request for st_physics from coldQCD
• Any interests from other PWGs? 
• Has space charge calibration, BTOW relative gains [Update from Gene]

5) Analysis Meeting - January

• Will have the next analysis meeting in early/mid January (will be online)
• January 15 - 19?
• Format? Want to have reports or general call for analysis updates?  

6) QM Proceedings

• Conference deadline - Dec 15, STAR internal deadline - Nov 24

1) Embedding Meetings

• Will start regular embedding meetings - Qinghua Xu will organize 
• Will also act as the platform for PAs and embedding helpers to present QA and feedback on embedding
• List of embedding helpers (current?) - LIST

2) Tracking task force Meetings

• Also will make the tracking task force meetings open to all
• The TF will set up the software and prepare the write up to enable others in the collaboration to perform the uncertainty studies
• Analyzers looking at different can update at this meeting 

3) Embedding test for GEISHA vs FLUKA

• STAR GEANT3 is using GEISHA hadronic package. Incorrect parametrization for pbar -- A (and nbar -- A) and K- -- A  interactions
• Can give incorrect absorption corrections, but effect expected to be small for STAR material budget. See SLIDES from Flemming
• Test sample produced with FLUKA for 19.6 GeV:
  • FLUKA:  /star/data105/embedding/production_19GeV_2019/AntiProtonFluka_10*_20214206
  • GEISHA:  /star/data105/embedding/production_19GeV_2019/AntiProton_30*_20214206 
• Can be important for net-p and other analyses, can CF/LFSUPC?FCV take a look?
• Also plans to check for 14.5 GeV BES-I data from Run 14

4) Production priorities

• Run23 priorities: production_AuAu_2023, production_AuAu_HalfField_2023, production_AuAu_ZeroField_2023
• Interests for half field and zero field data?
• Data streams? st_physics, st_forphoto, st_gamma, st_upc, st_upcjet, st_mtd