Meetings-2-4-2021

1. Instructions for Bluejeans meeting connection
2. Meeting ID: 290664653
3. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Thu 2/4/2021 2pm

Agenda

1. Tracking
   • chi^2 comparison
2. Detector related reports
   • FDC
     • Tuning of broken wires in MC, comparison with Spring 2017 Data
   • Kaon efficiencies (Chandra)[2]
3. GEM-TRD
   • gas analysis and padGEM studies
4. Other - collaboration meeting

Minutes

1. Other: No tracking talk at the collaboration meeting. Some tracking related topics will be discussed in other talks.
2. Tracking updates: Discussing the track-fitting quality, chi^2/ndf, vs theta for 2020, compared to the previous running periods. The deterioration for theta>10 deg should be studied with high rate reactions (Alex with rho) or just inclusively (Sean). Alex: many changes have been done in the tracking software for the 2020 production, need to evaluate their effect on the tracking quality. Discussions with Simon after the meeting: the new extrapolating algorithm doesn't affect the CDC region. The tracking problems could be related to the timing as the J/psi yields increased with loose timing cuts.
3. Detector-related analysis
   • CDC
     • Alex worked on tuning the CCDB to account for inefficient wires during the spring 2017 run period. He reduced the efficiency of one quarter of package 1, cell 1 to 0.9 to model the effect observed in data. In addition, he switched off a several wires in package 4, cell 6 at the beginning of the run (30274-30412) and half of the cell 6 in package 3 towards the end of the run (30995-31006). The same procedure should be done for the 2018 run periods. Implementing and verifying additional inefficient strips is more complicated, but could also be a project for the future.
   • FDC
4. GEM-TRD: We finished with the CDC gas tests: no Oxygen at 100ppm level, so CDC is very gas tight. The Oxygen we see with the gas chromatograph most likely comes from the tubing at/around the bubblers. Will restore the gas in the CDC and do the same tests with the FDC. Kondo performed analysis of the resolution of the padGEM (1x1 cm^2 pads) for different pad patterns: found significant improvement (~300 microns) when you have 3x3 pads above threshold.