Name: Kun Liu weekly discussion with students [ATLAS]
Start: 2022-10-19T16:00:00+08:00
End: 2022-10-19T17:05:00+08:00
Location: Online

- 16:00 → 16:05
  
  Introduction 5m
  
  General items.
  
  Speaker: Prof. Kun LIU (Tsung-Dao Lee Institute & Shanghai Jiao Tong University)
- 16:05 → 16:15
  ttWML and ttHML analyses status 10m
  
  Minutes
  
  Speaker: Nihal BRAHIMI (Tsung-Dao Lee Institute & Shanghai Jiao Tong University)
  ttWML analysis status:
  
  Analysis was granted approval to unblind almost two weeks ago.
  
  However, as unblinded fits were being rolled out, a bug was found leading to an underestimated generator modelling systematic being used in the fiducial fit. After the fix, the sensitivity became unexpectedly worse compared to the inclusive fit (+12%-11% vs +15%-13%)
  
  Detailed tests are being carried out to make sure acceptances for the fiducial fit are correctly calculated for the nominal and alternative generator ttW samples.
  
  Rest of fit setups are not problematic (inclusive, ratio and differential fits) and are being run in unblinded mode in parallel.
  
  Due to this delay, we are going to miss the Higgs 2022 milestone but the current backup plan is to go public for the LHCHWG meeting towards end of November. A decision will be made by the end of this week.
  
  ttHML analysis status:
  
  Most of the efforts focussed on defining MVA discriminants to be used in the 0-tau channels.
  
  Working closely with Jialin to come up with a good discriminant using DNN. Multiple configurations tested so far. Main bottleneck is the ttW CR and ttH SR definitions. Large anti-correlation (70%) observed between NF(ttH) and NF(ttW) which is not desirable.
  
  Currently preparing config to combine candidate SRs and fakes CRs from ttWML analysis as a proof of principle.
- 16:15 → 16:30
  
  ttH analysis 15m
  
  Speaker: jialin li
  
  1019_Kun_groupmeeting.pdf
- 16:30 → 16:45
  
  photon ID efficiency measurement & Zgamma analysis 15m
  
  Speaker: Kang Liu
  
  Progress of QT 20221019.pdf
- 16:45 → 17:00
  
  silicon tracker: HGTD 15m
  
  Minutes
  
  proposing paper structure & needed figs:
  
  1. introduction
  
  (Cross section of sensor, sensor pic; table of parameters)
  
  2. measurement setup
  
  (Pics of lab - Probe table, wiring, beta-scope/laser)
  
  3. IV and CV test results, uniformity among the 4?
  
  (IV plot, CV plot, 1/C^2 plot — for each sensor/pad, VBD/VGL of the 4 sensors)
  
  4. Charge collection
  
  (Waveform (amplitude, collected charge, RMS noise etc.),
  
  data analysis: pulse integral vs. injected charge, Bias voltage vs. charge)
  
  5. Position resolution & design optimization
  
  (collected charge @ each pad for 3 set of strips,
  
  data analysis: Bias voltage vs. resolution for 3 set of strips)
  
  6. Conclusion
- 17:00 → 17:05
  
  Non-academic items 5m
  
  Anything else?