Shu's weekly group discussion

Wednesday 4 Feb 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)

1. Finish Geant4 simulation of simplified PandaX-4T model and get Co60's energy spectrum.
2. Follow the analysis tutorial of H->ZZ->4l from ATLAS Open Data and finish the report.

10:10 → 10:20 Status

Speaker: Linjing Duan (TDLI, SJTU)

CEPC Zvvy nTGC

• The fitting procedure has been successfully run, and get a preliminary result
• An example of the operator G⁺ with fitting results is shown. Left: photon pT​ Right: missing energy

• The 95% confidence interval shows the parameter range compatible with the data at CEPC with s=240GeV and 20 ab⁻¹. Parameter values outside this range are statistically excluded.
• The two variables give very similar constraints on this operator, indicating similar sensitivity.

Plan to do:

• cross-check with Danning and complete the 2D crossterm fitting
• Understand the physics results under different experimental conditions, and compare them with the results from CEPC Zννˉγ Delphes fast simulation and CEPC Zℓℓγ full simulation（Danning's previous work)

 

 

 

 

 

 

 

 

 

 

 

 

 

10:20 → 10:30 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

10:30 → 10:40 Status

Speaker: Zelin Yan (TDLI, SJTU)

b573d9f94504e6ada5457736b4d3ce2.png

h_jet1_pt.png

H2a4b analysis: 

• Add Z+jets mc sample k-factor(~7%), lep effSF(~3%) and modify mc23a lumi to 29.6fb^-1(~7%)
• Z+jets mismatching: data/mc = 0.6 --> data/mc = 0.8

 

 

 

 

 

 

 

 

 

Wlllv analysis: 

• Train BDT model and add some simple kinematic vars 

Next: 

• H2a4b analysis: 
  • Add muon trigger SF into ntuple production(~11%)
  • update our easyjet pkg and generate new version ntuples 
• Wlllv analysis: 
  • Add more vars into NN( Z' analysis as reference, from Tairan)

10:40 → 10:50 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

Finished:

• Zbbj Calibration:
  • Use quickPull to rank the NPs and plotted the ranking plots;

• ssWWjj:
  • Plotted the vars distritbution for WZCR and fixed the negative SF issue;

Plan:

• Zbbj Calibration:
  • Prepare the summary presentation today;
• ssWWjj:
  • Investigate on the yields for the WZCR;

10:50 → 11:00 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:00 → 11:10 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

11:10 → 11:20 Status

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

CEPC

• e+e- ->ZH, Z->l+l- (e or muon), H->ss->4b @ 240 GeV
• Generated 1M events using MG5+PY8 for {10..60..5} GeV light singlet Higgs mass points (with Xuliang)
• Now I am running the detector simulation to the the reconstructed-level PFOs
• The final sample will be used to train the the jet tagging ParT from scratch
• The previous tagging model is based on the old detector geometry and it doesn't perform well for our case
• We will setup the model training by the end of this week

11:20 → 11:30 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

ssWW Analysis: Getting my hands on the FastFrames software. Looking at the (WZ) Control Region and the corresponding yields. 

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

11:30 Status

Speaker: Peixu Teng (SPA, SJTU)

102323.png

• Last Week:
  • I changed the confidence level to 95%, but there was no difference in the results.
  • The next thing i want to do is to find relevant data and create an image of LEP as shown in the diagram below(https://arxiv.org/pdf/1803.03262)
    • The main reason for doing this is that we are currently primarily comparing ourselves to him.
    • i think d_gamma is QED only, and d_{\gamma z} include electroweak interaction. I haven't finished reading it yet.
    • Based on the current results, our experimental conditions appear to be slightly superior and can encompass more aspects.

• To do list:
  • After completing the above steps, the parameter range needs to be extended to ensure consistency (0.001-100GeV)
  • Consider the suggestions regarding the "limits" mentioned earlier. However, I personally think it won't be very useful. When the mass approaches zero, it should obviously be indistinguishable from a neutrino. The behavior of particles with larger mass is what needs to be investigated, as mentioned above.

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)