Shu's weekly group discussion

Wednesday 29 Apr 2026, 10:00 → 13:35 Asia/Shanghai

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

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

10:00 → 10:05 Introduction & Announcements

10:05 → 10:15 Status

Speaker: Kang Yu (TDLI, SJTU)

1. Review the Einstein field equation
2. Finish 2 courses

10:15 → 10:25 Status

Speaker: Linjing Duan (TDLI, SJTU)

ZZy

• Searched for both signal and background MC23 samples in AMI; currently summarizing the available samples and prioritizing the main background processes to include.
  • Downloaded a subset of Run-3 data22 DAOD_PHYS files from period F8. A faster and more automated download workflow is still needed for larger samples.
  • Started testing the HGamCore framework with the downloaded data22 DAOD files. The framework can compile and open the input files, but the current configs/cutflows seem not fully compatible with the DAOD_PHYS format and need further checks.

Plan

• Finalize the list of dominant MC23 background samples, including availability and file counts.
• Produce a first Run-3 control-region plot similar to the Run-2 Zγ CR plot, starting with data and the dominant MC backgrounds.
 

10:25 → 10:35 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

weekly update (simulation) 290426.pptx

10:35 → 10:45 Status

Speaker: Zelin Yan (TDLI, SJTU)

[Today's focus:]

• HGTD FELIX monitoring: 
  • Modify the new design including hardware health and link 
  • Add refresh rate for polling 
• Wlllv analysis: 
  • Add non-prompt(V+jets)  ntuple into BDT score prediction and fitting 
  • Generate ntuples with systematics but high failure rate issue in mc23e WZ sample when submiting on grid 
• Others: 
  • Finish wafer001 and wafer002 test for  production  from April 24 to April 26

[Next plans: ]

• HGTD FELIX monitoring:
  • Implement link alignment in  OPCUA server 
  • Ask wincc  sub-lisence status before May Day 
• Wlllv analysis: 
  • Add non-promp(V + jets) bkg into xgboost training 
  • Fix the bug in mc23e  WZ sys  ntuple production 
  • Prepare status report in SM WZ subgroup meeting on May 13

10:45 → 10:55 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

Today's focus: 

[ssWW]:

• Modified FastFrame framework to make sure it could run the latest ntuples (DNN related);
• Added the truth information in our fastframe framrework;

[Hyy*]:

• Write down a new script to validate  breakdown fit results (quickFit vs quickstate);

[Zbbj Calibration]:

• Validated the High pT region (> 1 TeV) LRjet distribution with Elisabeth;

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Plans: 

 

[ssWW]:

• Launch a new ntuple production process (latest samples still miss forward jets information);
• Make a new MR truth information and truth selection implemented;
• Train the ParT with the latest ntuples;

[Hyy*]:

• Check the breakdown valiation fit results;

[DarkSHINE]:

• Fixed the typo in Section 3.3 of our CDR;

[Zbbj Calibration]:

• Push all my fitting framework related codes to the main branch;

10:55 → 11:05 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

 

Sterile neutrino, discussed with Yifan Chen

different mass fermion dipole coupling

 

However, for equal-mass fermion dipole coupling:

• we don't need to compete to other curved neutrino experiment limit
• Forbid N > v γ decay

 

Also, by not considering specific UV complete model, we can only consider dγ LEP 91GeV limit.

Equal-mass fermion dipole coupling

 

11:05 → 11:15 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

Today's focus: 

[STCF EMC CsI Test]:

• Target: Try using SiPMs to improve the time resolution of the CsI crystal detector module.
• We have received the crystals sent from USTC. We also made the dedicated PCBs for the tests and spent a lot of time completing the experimental setup together with Junwei and Haydar.

• We collected cosmic-ray waveforms using different SiPMs and several different electronics configurations, and analyzed the timing resolution, which is about 1.5 ns. 

 

[DarkSHINE ECAL Simulation]:

• .Refined some parameters in the optical simulation and simulated the differences in the crystal response at different energies

[DarkSHINE ECAL prototype electroncs]:

• Bi-weekly meeting yesterday afternoon: The USTC team presented simulations of the circuit response at MHz rates, analyzed baseline pile-up, and discussed the selection of the power-supply chip and the voltage-control module.

 

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Immediate Plans: 

 

• [STCF EMC CsI Test]: Further improve the circuit and carry out more parameter-scan tests to improve the timing resolution
• [DarkSHINE ECAL Simulation]: Try to evaluate the impact of the detector unit’s response non-uniformity on the overall detector performance

11:15 → 11:25 Status

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

DarkSHINE

• Completed a detail review of chapter 1 and 4
• Finished editing the Target section
• Next step:
  • Editing the Ecal detector section
  • Carefully review and prepare comments for chapter 3
  • I will setup the git versioning for the document
• Today we will continue the cosmic ray test with Chunxiang

Exotic Higgs decay analysis

• I am currently investigating a new jet finding algorithm called the XCone algorithm (https://arxiv.org/abs/1508.01518)
• This jet algorithm can be used to resolve boosted jet
• Since it was never used in CEPC analyses, I will first benchmark the jet performance against the eekT algorithm

11:25 → 11:35 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

Today's focus: 

[Hyy*]:

• Fake region issue still on hold, as we need to produce new n-tuple first. This is work in progress, and should be resolved soon (?). The plotting macro only requires these new n-tuples to be ready.

[ssWW]:

• WZ_QCD reweighting applied on current n-tuples with the latest changes (now that the group AC validated Baihong's investigation on the differences on the yield): Results are slightly better.
• Also, new n-tuples should be in production (more in Baihong's presentation? -> He caught something in the current ones).  This correction could have an important impact on the reweighing: waiting for them to be ready, and reaply the script on these.

[ZZy]:

• Steps have been clearly identified, through discussions with the team. Progress has been made, but we need to put more efforts to present results for early May.

 

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Immediate Plans: 

 

• [Hyy*]: Continue with the fake templates.
• [ZZy]: Produce as many plots (those identified) as possible for next week.
• [ssWW]: Additional plots (i.e. stacked histogram comparison before/after m_jj WZ_QCD reweighting) could be worth producing as well. Will continue exploring this if time allows. 

11:35 → 12:30 REU: Undergrad Research Discussions

11:35 Status

Speaker: Peixu Teng (SPA, SJTU)

屏幕截图 2026-04-29 103625.png

• A midterm exam.
• Regenerate the LUT with 4GeV.
• There is no problem with the code-level test. Proceed to the next step after comparing with the ds settings.
• Start writing the graduation thesis.

To do list:

• Compare the final result of dp and sun
• Writing the graduation thesis 

11:40 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

Today's focus: 

[STCF]:

• Get the most probable value (MPV) of the crystal energy spectrum obtained from muons to calibrate the uncorrected e+ energy measured in the experiment.

• Comparison of momentum response between simulation and experiment.

           The small difference between them arises from differences between the simulation setup and the real detector.

• By applying momentum spread in the simulation, energy resolution consistent with that of the experimental data is obtained.

           
            ( I will try to refer to relevant theories to further validate and support this result afterwards.

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Plans:

• Prepare for my graduation thesis defense

11:45 Status

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