Meeting time: Tuesday
California: 7:30 AM Germany: 4:30 PM China: 10:30 PM
Zoom link: https://gsi-fair.zoom.us/j/92845620778 Passcode: 965311 

Link to previous meetings: link

17/6/2025
Mathias: slides
Liubing: 
Ziyue: slides

Action items:
- Calculate the 0–5% 3.2 GeV spectra; send the corresponding pT binning to Mathias (Liubing/Ziyue)
- Use the received pT binning to obtain the spectra for 0–5% at 3.2 GeV. All: Share your results with one another and perform comparisons (Mathias)

23/6/2025
Ziyue: slides
Liubing: slides
Mathias: slides

Action items:
- Compare and prepare a few slides on signal extraction for charged kaons to investigate the differences between data at high pT (functions for describing background) and the statistical error (Mathias/Ziyue)
- Add E866 data the kaon plot for comparison (Ziyue)
- For 3.2 GeV, use 1.139 as beam rapidity
- Use an alternate rapidity binning (-1.05, -0.95, -0.85, ...) for comparison purposes (Mathias/Ziyue) 
(can have two different rapidity binning, one for internal comparison, one for publication)
- quantify the effect of nhits cut on the lowest pT bin for data and MC, slide 3-9 add a linear scaled version (Liubing)

30/6/2025
Mathias:
Liubing: slides
Ziyue: slides

- Compare TOF matching efficiency, TPC tracking efficiency and signal counts separately (all)
- Use exponential-functional forms to fit the pion data, find out which data can be described by such functions
and which one has a kink like structure around pT=0.5 GeV, and fix the underlying issue (Mathias, Liubing)
- For lowest pT pion, Mathias spectra looks unnatural, and is inconsistent with Liubing, need more investigation (Mathias)
- For target rapidity, major difference is observed, needs investigation (Mathias, Liubing)
- Compare with AGS measurements (all)
- Use the integral of the fit function (Ziyue)
- Check the effect of different background functions for kaons (Ziyue, Mathias)

8/7/2025
Mathias: slides
Ziyue: slides

- Use the same event/track level cuts (All)
- Vr(-0.3,-2.0)<2cm
- nhitsfit > 20
- nhitsratio > 0.51
(I would suggest Liubing to do the same for the next iteration with pions/protons)
- Prepare a small run list for comparison and send to Ziyue (Mathias)
- Share fitting parameters with Mathias (Ziyue)
- Compare signal counts and TOF matching efficeincy (can start with -0.25<y<-0.15) (Mathias/Ziyue)

15/7/2025
Mathias: slides
Ziyue: slides
Liubing: slides
- Use initial fit parameters from Ziyue to refit (Mathias)
- Kaon bTOF efficiency: Use selected run list to determine kaon TOF matching efficiency, compare cuts, denominator, numerator
(Mathias, Ziyue)
- Use Mathias's run list to compare pion and proton event number, raw counts/event number, TPC efficiency, TOF matching efficiency, spectra, all rapidity bins
- Finer pT binning for TPC efficiency (Mathias)
- Compare with AGS data (all)

22/7/2025
Mathias: slides  - the labelling for Kaon is reversed, Mathias's resule should be lower than Ziyue's. 
Ziyue: slides
Liubing: slides
 - list all the event level cuts, track quality cuts, tpc pid cuts, tof matching requirement, tof pid cuts. TO avoid any further in-consistent 
 - check the exact number of events used for the 0-5% centrality
 - pick up several rapidity/pT bins, check the exact m2 distributions, total entries, then check the fitting details, and the extracted raw counts (with errors). The result must be consistent with each other
 - following with efficiency related checks 

7/8/2025
Mathias: 
Ziyue: slides
- Confirm offline whether the histogram projection method is correct, ensuring we are making a true apples-to-apples comparison. (Ziyue, Mathias)

- If the issue is not due to the projection method, select one file, compare the mass-squared distributions and the number of events. Since there will be no broken jobs, the results should match exactly. If they still do not match, check the applied cuts step-by-step at the code level. (Ziyue, Mathias)

Resources:
Coulomb potential paper from AGS paper