Shu's weekly group discussion

Wednesday 22 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. Preparing for the midterm exam

10:15 → 10:25 Status

Speaker: Linjing Duan (TDLI, SJTU)

ZZy_4.22.pptx

ZZy:

• Established the data and MC selection strategy for the Run3 analysis
• Searched for the required data in AMI and the corresponding MC samples.
• More details are included in the backup slides; the material is still being updated.

Next:

• Confirm with Matthias that the sample-selection procedure is correct.
• Finalize the full list of data and MC samples needed for the analysis.
• Prepare slides for requesting a Run 3 ZZγ kickoff meeting with the EWK conveners.

10:25 → 10:35 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

Geometric simplification was implemented as a troubleshooting step to identify previous numerical anomalies.

The simulation was configured to reflect the following experimental parameters:

Forced Convection: An inlet air velocity of 5ms^-1 was applied to the enclosure.

Heat Load (Active Components):

Chips: Each of the 9 chips was assigned a power dissipation of 1.55W

SiPM Sensors: The SiPMs were set to a power load of 1mW

The ansys simulation shows there is thermal diffusion from the chips to pcb but  it yielded extreme temperatures ranging from -4.4C to 500C.

The COMSOL simulation shows a more reasonable thermal distribution (approx 30C to 170C).

10:35 → 10:45 Status

Speaker: Zelin Yan (TDLI, SJTU)

[Today's foucus:]

• HGTD Felix monitoring: 
  • Construct complete workflow chain(felix-io -> opc-ua server -> wincc oa(replaced by uaexpert temporarily))
  • Add more vars into opc-ua server
• Wlllv analysis: 
  • Update SR selection and input features for xgboost train
  • Get preliminary training and fit result 
  • Modify analysis framework code for ntuple production with sys, mainly focus on classification of theoretical uncertainties(qcd scale, pdf, alphas and others)
• Others: 
  • Wafer test from 4/19 to 4/20

[Next plans:]

• HGTD Felix monitoring: 
  • Focus on link algnment 
• Wlllv analysis: 
  • Optimize xgboost input and get preliminary fit result with sys
• Others: 
  • Wafer test from 4/24 to 4/26

10:45 → 10:55 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

Today's focus: 

[ssWW]:

• Used old easyjet framework to run the different sherpa version of WZQCD process;
  • Yields:  old (sherpa 2.2.2): 884.343+- 4.395 new(sherpa 2.2.12): 762.143+-2.092
  • Jet related cut would extream the difference;

• Retrained our ParT model for LL discrimination using old ntuples;
  • Need double check with the latest ntuples (DNN wp related);

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Plans: 

 

[ssWW]:

• Use the new ntuples with the DNN WPs to train the ParT model;
• Update the easyjet framrwork with truth information implemented;

[Hyy*]:

• Check the breakdown valiation fit strategy and results;

[Zbbj Calibration]:

• Push all my fitting framework related codes to the main branch;
• Work with Changqiao for derive the final scale factor;

10:55 → 11:05 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:05 → 11:15 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

Today's focus: 

DarkSHINE:

• ECAL simulation and digitization
  • Refine the digitization model and further validate the digitization workflow, starting with the scintillator response through optical simulation. Studied the difference in the crystal’s response to particles incident at different positions or directions
  • The simulation results indicate a response non-uniformity of about 1.18%, while the measured value is about 0.8%.
• 
•  
• 

STCF EMC:

• Received the pCsI crystals from USTC and made some readout boards as well as the experimental setup required. 
• 

Plan:  

DarkSHINE:

• ECAL simulation and digitization: perform a scan with incident particles at different energies

STCF EMC:

• Carry out some tests over the next few days, including SiPM intrinsic timing resolution test and crystal cosmic ray test 

11:15 → 11:25 Status

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

DarkSHINE

1. HCal cosmic ray test
   • We found the light output to be >200 p.e., which is twice as higher than the previous measurement
   • Next step: we need to check the setup and post-processing codes, then proceed with the non-uniformity test
2. Paper review
   • Completed review of one section, only the figures were left to be updated
   • Next step: Reviewing the next section assigned to me, and preparing general comments with Yifan
   • Waiting for response from other members from Minhang
3. ATLAS HGTD
   • Planned to participate in the wafer test in the next round

11:25 → 11:35 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

Today's focus: 

[Hyy*]:

• Fake CR : From last GM, it has been advised by AC to enforce all of the (non-orthogonal) SR selections by hands one by one when defining the CR. 
• Got indication about where to find clear definitions of the objects, and where to investigate for the CR implementation.
• Safety test: Implement SR manually and compare to already well-defined SR objects. 
  • Got some issues here. After navigating around the Run 2 and Run 3 differences (in naming conventions for instance), some needed branches for Run 3 are not accessible in the ntuple (as far as I can tell). 
  • Asked guidance about this, unfortunately experts are not available for now.
  • Investigated the HGamGamStar software to see if I can make sense on all of it on my own. (hard).

 

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Immediate Plans: 

 

• [Hyy*]: Continuing the investigation on HGamGamStar, but no longer on a 24/7 basis. 
• [ZZy]: Instead I will split my focus evenly on this analysis too, aiming to deliver results timely with Linjing.
• [ssWW]: Incoming short discussion with Baihong planned, to see if WZ_CR deserve more efforts on our side (~hard to tell before I run the reweighted macro on the new samples), to see if we can aim wokring on a different CR (charge flip?) starting this week?

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

11:35 Status

Speaker: Peixu Teng (SPA, SJTU)

Weekly Summary:

• LEP:

• The LEP exclusion curve is obtained by using the paper’s(PhysRevD.98.115015) electroweak gauge-invariant dipole model, computing the LEP1 production cross section analytically, multiplying by the photon-cut acceptance and the 1 m decay probability, and then solving for the coupling where the visible rate reaches the LEP single-photon limit.
• The DarkSHINE part is obtained by using the previous model and caculated by MG5.
• DarkSHINE
• The LUT extraction process has been completed. Preliminary testing of the simulation program indicates no issues(8GeV)

(A small test to see if it works.

Next_Plan:

• conduct simulations in alignment with the DS work.
• Check to see if there are any additional needs in LEP.

11:40 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

Today's focus: 

[STCF]:

• Evaluate the influence of momentum dispersion on energy resolution in simulations.(At present, only for positrons at 1.0 GeV and 1.5 GeV, setting a momentum dispersion of 15% relative to their intrinsic momentum yields results consistent with the experimental data; the dispersion ratios for the remaining energy points have not yet been determined)
• 1GeV(From left to right: simulation, simulation with 15% momentum dispersion, experiment)

• 1.5GeV

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Plans: 

 

[STCF]:

• Determine the momentum dispersion value at each energy point to bring the simulated energy resolution close to the experimental results, and plot the comparison curves.

11:45 Status

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