Shu's weekly group discussion

Wednesday 23 Sept 2026, 10:00 → 13:35 Asia/Shanghai

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

Haidar Mas'ud Alfanda (TDLI, SJTU), Matthias Tartarin (TDLI, SJTU)

Online Zoom meeting room:

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

(PIN protected, see message from the group chat announcement)

10:00 → 10:05 Introduction & Announcements

Meeting's note: []

 

Announcements:

• To select the best time for future group meetings: Please fill as if it was a general week template, and not specifically for the numbers of the day indicated there (i.e. from September 21 to September 27 are just examples).
  Link:     https://www.when2meet.com/?38761043-QEmGQ

 

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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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10:05 → 10:10 Status

Speaker: Zhijing Zhang (TDLI, SJTU)

Today's focus:

• Started courses of the new semester.
• Followed Zhiyu to perform some simple test procedures.
• Ran simulations on the intrinsic radioactivity of LYSO crystals. Current results are unsatisfactory and need optimization.
• Read literatures about calorimeters.

Plans: 

• Carry out measurements on luminescence decay time of pCsI.
• Continue optimizing the optical simulation of LYSO crystals to match the simulated energy spectrum with experimental data.

10:10 → 10:20 Status

Speaker: Kang Yu (TDLI, SJTU)

[Inclusive ZZ]:

1.  No update
2.  To-do: unclear; likely tied to requesting samples and reading JobOptions

 

[VBS ZZ]:

1.  Add baseline cut for EW ZZ(LL+TL)jj polarization angle's distribution
   1.  Cut: number of jets >= 2; invariant mass of two leading jets > 100 GeV
2.  Join eγ CP task (learn from Evan)
3.  To-do: 
   1.  Add QCD background for the above distribution
   2.  Reproduce other variable's distribution

 

[AQP: GN3XPV01 MC-to-MC Scale Factors]:

1.  Almost finish Training Dataset Dumper Tutorial (except adding GN3EPCLV01 tagger)
2.  Have a discussion with technical supervisor. Target: reproduce Ricarrdo's plots
3.  To-do:
   1. prepare the kick-off meeting before next Wednesday (9/30 21:00)
   2. prepare the poster on CLHCP before 10/18

 

[Others]:

1.  Take wafer test shift

10:20 → 10:30 Status

Speaker: Linjing Duan (TDLI, SJTU)

ZZy

Finished

• Completed Rivet validation with the 40k-event ZZγ sample at 13.6 TeV.
• Checked key fiducial distributions and cutflow.
• Performed preliminary cross-section comparison.

Plan

• Finish remaining validation checks and update the MC request ticket.
• Prepare materials for the EWK approval discussion.

 

HGTD

• No major updates last week.
• Plan to develop a more detailed roadmap for this task and schedule a discussion with Alex

10:30 → 10:40 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

10:40 → 10:50 Status

Speaker: Zelin Yan (TDLI, SJTU)

[Today's focus:]

• HGTD FELIX Monitoring:
  • Integrate all WinCC OA panels to one panel offline.
• H2a4b analysis: 
  • Finish all samples production.
  • Finish preliminary fit result and expected upper limit with all LLP and Prompt samples. 
  • Find abnormal yields in semi LLP samples -> jet3 and jet4 can't pass b-tag. 

[Next Plans:]

• HGTD FELIX Monitoring: 
  • ask Aonan about constrain connection outside from USTC. 
  • Finish test on using OPCUA server to modify FELIX status.
• Wlllv analysis: 
  • Figure out the high sys on muon isolation and QCD scale.
• H2a4b analysis: 
  • Prepare status report for HLRS meeting tmr.

10:50 → 11:00 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

11:00 → 11:10 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:10 → 11:20 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

Today's focus: 

[DarkSHINE ECAL Prototype Electronics]:

• Tested the crosstalk effects of candidate multi-channel FPC connectors for the prototype’s front-end electronics together with Zhijing. No significant crosstalk was observed in the tests
  • Yellow: input channel, others: the channels adjacent to input channel
  • 

 

 

 

 

 

 

 

 

 

 

 

 

[DarkSHINE Simulation and Analysis ]:

• I organized my code for the BDT multivariate signal-background analysis and uploaded it to GitLab.
  • DarkSHINE / DarkSHINE BDT · GitLab

 

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Plans: 

• [DarkSHINE MVA] :
  • Plan to compare different ML models, try training directly on low-level cell variables, and incorporate timing information
• [STCF EMC]：
  • Finish the measurement on scintillation decay time of CsI crystals with Zhijing
  • Design the SiPM array circuit board
• [CEPC Crystal ECAL]：
  • Continue exploring the potential of applying the dual-readout method to the existing geometry

11:20 → 11:30 Status

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

DarkSHINE

• Finished
  • Event generation using MG5 for all the Fermionic DM: MCP, EDM, MDM, CR, AM
  • Validated my simulation results with Rui
  • Created a look-up-table for the detector simulation
• Plans
  • Get the exclusion limits at truth level to gauge the sensitivity at DarkSHINE 
  • Full detector simulation: DSimu+DAna

 

Exotic Higgs decay

• Plans
  • Produce non-Higgs background
  • The BDT code is in good progress; it is the prior task at the moment

 

ATLAS HGTD

• Will participate in the wafer test tomorrow 

11:30 → 11:40 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

 

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Today's focus: 

[ssWW]:

• Focused back on Unfolding studies using the Easyjet framework. Modified easyjet so the truth information are now effectively created and stored.
• Presentation of current status to the internal group.
  
  

[ZZy]:

• Group meeting yesterday, members tasks are a little more organised now. Some items to be looked into for next group meeting (mention of a software that merged Easyjet+Fastframes in one ; How to assess the combination studies to make sure it does not take too much efforts away from the 5sigma observation result; and look into CMS Run-2 paper to identify and study differences in strategies).
• CP task is still opened; ZZU colleagues answered earlier this week: Muon CP convener came back with one project "Maintenance of the FakeBkgTool". ZZU colleagues asked if we were familiar with it, as they do not have experience in Muon CP themselves. 

 

[VBS_KappaLambda]:

• Working on restoration of unitarity bounds with the new UFO model. Interesting results, but validation in progress.

 

 

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Plans: 

• [ssWW]: Instead of implementing the unfolding in Easyjet, would be better to aim to have the main FastFrames ready for unfolding with the VBSTools n-tuples. The former should come after.
• [Hyy*]: Plan to focus on the poster for ATLAS Week as a priority. If time allows, then go back into the merged electron algo study. 
• [VBS_KappaLambda]: Detector level studies are still in consideration ; Validating the restoration of unitarity bounds looks more promising at the moment.
• [ZZy] In addition to topics to search for next group meeting, a direction I can work on solo for now : Event selection.
  Naïve plan would be to re-validate every selection against current Run-3 detector, trigger, reconstruction, calibration, and CP recommendations. Is there a typical documentation for this kind of study? Or is it usually done on the go?

11:40 → 12:35 REU: Undergraduate Research Discussions

11:40 Status (w/ Linjing&Danning)

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

11:50 Status (w/ Haydar)

Speakers: Hansheng Ye, Mingyu Huang (Univ. of Manchester (GB))

This week's focus:

-Finish the production and validation of the 500k events ZH, H→ccˉ Z→dilep

-Delivered the presentation with Haidar and Prof Li yesterday with Mingyu

-Overall, the H→ccˉsample has now provided a useful detector-level baseline for validating the current CEPCSW reconstruction and flavour-tagging chain.

-Will conclude the internship this week

 

Long term focus:

-4 fermion background at CEPC

-Will start with two-fermion process e+e−→qqˉ​, using the existing official CEPC samples at 240 GeV after Haidar transfered all H→ccˉ reco files.

-The inclusive qqˉ sample is available in: /cefs/data/stdhep/CEPC240/2fermions/E240.Pqq.e0.p0.whizard195

-Each StdHep file contains 20,000 events, so 25 files correspond to 500,000 events.

-The first goal will be to measure how many qqˉq\bar q events survive the Z→ee/μμ selection, since the hard process does not contain a genuine prompt Z→ℓ+ℓ−decay. This will provide the first estimate of the rejection power of the current preselection against a realistic non-Higgs background.

12:00 Status (w/ Xuliang)

Speaker: Hongyi Chen (University of Nottingham, Ningbo, China)

Finished

• Learned the XGBoost BDT training and model-export workflow.
• Learned how to use Conifer to convert trained BDT models for HLS deployment.
• Built an integrated U-Net–BDT training template.

Plan

• Wait for Xuliang’s U-Net output data.
• Train the BDT using the received data.
• Prepare golden inputs for HLS validation.