Shu's weekly group discussion

Wednesday 18 Mar 2026, 10:00 → 13:35 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N630 - Smart Classroom (Tsung-Dao Lee Institute)

Matthias Tartarin (TDLI/SJTU)

点击链接入会，或添加至会议列表：

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

Introduction & Announcements

Meeting's note: After the meeting

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Today's focus: 

[1st project/analysis: XXX ]:

• item 1
  • sub-item 1
  • sub-item 2
• item 2
• [...]

[2nd project/analysis: XXX ]:

• item 1
• item 2
• [...]

[...]

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Plans: 

• [optional: indicate which project/analysis it refers to] item 1
• [optional: indicate which project/analysis it refers to] item 2

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1 Status

Speaker: Kang Yu (TDLI, SJTU)

2 Status

Speaker: Linjing Duan (TDLI, SJTU)

Today's focus:

[CEPC Zvvy nTGC]:

• cross-checked the fitting results with Danning: the 1D results look fine, while the 2D results still need theory discussion.
• I have drafted the theoretical framework section of the paper.
• discussed with Yuning and helped complete the CEPCSW environment setup and run the full simulation workflow successfully.

Plans:

• plan to finalize the systematics part by defining the signal and background uncertainties and implementing the corresponding nuisance parameters in the fit.
• plan to draft the simulation section of the paper

3 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

4 Status

Speaker: Zelin Yan (TDLI, SJTU)

5 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

6 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

7 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

8 Status

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

9 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

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Today's focus: 

[ssWW Analysis]:

• mc23 samples downloaded using (pre-Baihong fix) Easyjet: Done
  • Only one file missing, to be discussed which tag to use/update.
  • Automatic macro working very well off-line (as far as I can tell). New update: If files were corrupted during a previous download, the new version of the macro automatically detect them and handles them. So it is even more care-free now. 
• New version of easyjet (post-Baihong fix), with the generation of the new mc23 files: Creation of the files on-going.

[Hyy*]:

• Analysis near the end, but I started helping out:
  • Danning: She gave me directions to help out. She recently just obtained fakes fractions, and wanted to recreate the legacy work on comparing mc samples m_lly invariant mass distribution with data, for the 9 categories defined for the anlaysis. So I created a python script to study this comparison using h004 mc samples (prompt lly and fakes [photons ; leptons]) and data.The plots I produces are not perfect yet, so I am waiting to see if Danning validates the many choices I made in the scripts (choice of mc files, coding of the selections, plotting normalisations, etc ..) 
     

One of the best plot produced, for the m_lly invariant mass of the high pt merged ee category. To be validated by Danning.
 

•  
  • Contacted Laura yesterday. She gave me two items that are on-going, to think about. One of them needs the fakes to be more mature, but the other one is about background modelling. She was questionning the need to use "difficult" fit functions. And to understand why the spurious signal fails the other simpler background functions -> A bit of investigating needed here.

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Plans: 

• [ssWW] Need to download the entire the new mc23 files to produce the "final" reweighting plot, and together with Baihong mc20 work on the yield, present during the GM. I also got into contact with John, so we can start being more active in the group.
• [Hyy*]: Continue working closely with Danning, and starting contributing to Laura's item(s) discussed yesterday. In particular for the latter I will have some documentation to read carefully before investigating the issue correctly.

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REU: Undergrad Research Discussions

10 Status

Speaker: Peixu Teng (SPA, SJTU)

11 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

Today’s focus:

• Gain a detailed understanding of the basic structure and working principle of the ECAL in STCF through the CDR.
• Test the energy and time resolution of electrons at different energies under background‑free conditions.(Codes still need improvement)

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Plans:

• Use OSCAR to simulate the energy response of photons from 0.1 GeV to 3.5 GeV, and obtained the energy, time, and position resolution curves.
• Start writing the graduation thesis.

12 Status

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