Shu's weekly group discussion

Wednesday 4 Mar 2026, 10:00 → 13:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N631 - Smart Classroom (Tsung-Dao Lee Institute)

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https://cern.zoom.us/j/4042031778

10:00 → 10:10 Status

Speaker: Kang Yu (TDLI, SJTU)

10:10 → 10:20 Status

Speaker: Linjing Duan (TDLI, SJTU)

CEPC Zvvy nTGC

• The 1D and 2D fits have both been completed.
• For 1D, I found that for all 9 operators, the 95% confidence intervals from MissingE and photon pT​ fits are almost the same.
• I am not sure whether this is because the two variables have similar sensitivity in the Zvvy process, further checks and discussion with Danning are needed.
• For 2D, the fitting is used to study the correlations between different pairs of operators.
  • For example, this is the 2D likelihood contour for the Wilson coefficients C_BB​ and C_BW.
  • The color scale represents −2Δlog⁡L. The solid contour corresponds to the 68% confidence level, and the dashed contour corresponds to the 95% confidence level.
  • The elongated shape shows that the two coefficients are highly correlated.

• In summary, I am currently waiting for Danning’s results for cross-check and further discussion.

 

 

 

10:20 → 10:30 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

 

The IV curve measurement of SiPM is redo under the presence of light.

the result appears to look similar to the trend in hamamatsu manual

since under light condition, the graph shown a good trend that allow us to determine the breakdown voltage, the experiment would redo under light condition at different temperature

10:30 → 10:40 Status

Speaker: Zelin Yan (TDLI, SJTU)

wp65.png

wp90.png

H2a4b analysis: 

• optimize jet selection: choose only first 4 jets as our jets selection(for simplication, already checked)
• update signal ptag  to p6697 and bkg to p7017 
• update Analysis framework code(easyjet + coffea)

 

 

 

 

 

 

 

 

 

Wlllv analysis: 

• construct and train BDT model by using mc23a dataset 
• get priliminary fit result and expected upper limit for SR 

Plans: 

H2a4b analysis: 

• new ntuple production(on-going)
• use pcbt score to flex b-tag selection
• scan the Z+jets side-band to construct Z+jets HF CR 

Wlllv analysis: 

• add more var into BDT training 

HGTD upgrade:

• Felix monitoring: 
  • link OPCUA-server with FELIX card at USTC

10:40 → 10:50 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

Finished:

• Hyy*:
  • Updated the theory systematics (for BR and lumi for Run 3);
  • Updated the correlation schemes based on the definition in Run 3 H->Zy analysis;
• ssWW:
  • Fixed the selection rules for WZCR and validated the yeilds for MC20 EWKWZ process; 
  • (Yields comparison for MC20 EWKWZ:   Rel 21: 141.   <--> Rel 22: 144.)

Plan:

• Hyy*:
  • Updateed the nominal dataset based on the XMLs shared by Laura;
  • Reproduce all the results and prepare the presentation;
• ssWW:
  • Reproduce all the samples with Matt;
  • Update the definition for WZCR in FastFrames;
  • Work with Matt for the Mjj reweighting for WZCR;
• Xbb Calib:
  • Talk with Changqiao for the next step's plan;

10:50 → 11:00 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:00 → 11:10 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

DarkSHINE

• Finish DAna and BDT training with new ECAL and HCAL digitized variables
• Sensitivity analysis is ongoing

11:10 → 11:20 Status

Speaker: Haidar Mas'ud Alfanda (TDLI, SJTU)

• Finished the signal sample production – 1M events per mass points {10..60..5}
• Processing ntuples for isolating leptons from Z decay
• Wafer probing test at Fudan University from Thursday to Sunday

11:20 → 11:30 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

TDLI_WeeklyMinutes_03_04.pptx

ssWW analysis:  Working on the WZ CR (Control Region) : 

• After yield validation with Run2, we will use the same reweighting strategy as in the legacy analysis. 
  In more detail: Reweighting of the WZ QCD model managed by using the variable M_jj (invariant mass of the di-jet system) to rescale MC samples compared to the data (Section 6.1.1, ~ page 32 of the legacy paper).
• Code has been produced, and validated on dummy MC samples.
• To go further, production of Run3 MC and data samples using FastFrames. Issue (?) to be discussed about the WZ_QCD M_jj distribution, as the current weights are mainly negative:

      

11:30 → 12:25 REU: Undergrad Research Discussions

11:30 Status

Speaker: Peixu Teng (SPA, SJTU)

• Have get LEP settings and calculating exclusion diagram.
  • Overall, there is not much problem in the low-quality range, but for the high-quality range, especially when considering decay in collider experiments, the situation becomes complicated. I am trying to solve this problem using MadSpin.
  • Apart from this, the overall trend is roughly the same.

• cut:
  • ∣cosθγ​∣≤0.7, Eγ​≥0.7 GeV, Consider the decay probability within 1m
  • from https://arxiv.org/pdf/1803.03262

11:35 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

11:40 Status

Speakers: Jiacheng Shi (SPA, SJTU), Yuning Chen (Zhiyuan College, SJTU), Zhengyang Qian (SPA, SJTU)