Shu's weekly group discussion

Wednesday 20 May 2026, 10:00 → 13:35 Asia/Shanghai

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

点击链接入会，或添加至会议列表：

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

10:00 → 10:05 Introduction & Announcements

Meeting's note: [To be written after the meeting]

 

Announcements:

• From email received on May 18:“A Year in ATLAS” - June 2026Dear Early Career Scientists, We are happy to announce the next iteration of “A Year in ATLAS,” taking place at CERN and on Zoom on Monday, June 29th! This event is primarily targeted toward ATLAS members who already finished/are about to finish their authorship qualification project, though anyone is more than welcome!
  The event will feature several explanatory talks (such as ATLAS organization structure) and a panel discussion on making your way in the collaboration. We’ve also taken recent feedback into consideration and have adjusted the agenda accordingly. Please join!

 

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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 → 10:15 Status

Speaker: Kang Yu (TDLI, SJTU)

10:15 → 10:25 Status

Speaker: Linjing Duan (TDLI, SJTU)

ZZy finished

• finished compiling all samples currently used in the Run 3 Kickoff Framework, as well as all available signal and background samples from the MC production. The full list with bl-0 paths will be uploaded today.
• successfully downloaded and ran Sherpa 2.2.12 and Powheg to compute the cross sections for the signal processes llllγ and ZH (H→Zγ) at 13 TeV (Run 2) and 13.6 TeV (Run 3), respectively. The cross-section calculation provides the theoretical baseline for quantifying signal yield gains at 13.6 TeV, validating generator predictions, and anchoring the Run 3 analysis normalization.

Plans

• complete the cross-section calculation for the ZZγ signal process, with cross-checks between Sherpa and Powheg results to ensure robustness
• get the framework fully running on my side with the complete sample set, so we're better positioned for efficient post-kickoff analysis.

10:25 → 10:35 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

Thermal Analysis of ECAL prototype.pptx

10:35 → 10:45 Status

Speaker: Zelin Yan (TDLI, SJTU)

[Today's focus:]

• HGTD FELIX Monitoring: 
  • Successfully setup WinCC and visualization locally
  • OPC UA connection works
  • FPGA temperature is mapped to a WinCC OA datapoint and visualized in a trend panel for testing
• Wlllv analysis: 
  • Get preliminary fit result with full syst.
• Others: 
  • Wafer test.

[Next plans:]

• HGTD FELIX Monitoring: 
  • Add more vars into visualization
  • Organize datapoints into a structured FELIX card model.
  • Add alarms and archiving rules for key status variables.
• Wlllv analysis: 
  • Fix a small bug in trigger syst. and lepton weight reco syst. 
  • Prepare status report slides for SM W/Z subgroup meeting, which is postponed to next Wednesday.

10:45 → 10:55 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

Today's focus: 

[ssWW]:

• New MR was submitted for truth information obtain in easyjet framework;
• Train the ParT with hyper parameter scanning; 
  • Results are similar - model is not sensitive to hyper parameters;

[Hyy*]:

• Found the errors in the breakdown fit;

 

Plans: 

 

[ssWW]:

• Prepare to present the ParT training results;

[Hyy*]:

• Wait for the updates from the background estimation and SS;
• Update the comnination results with new workspace provided;
• Do the breakdown test again;

10:55 → 11:05 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:05 → 11:15 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

Today's focus: 

[STCF EMC]:

• To improve the timing resolution of the CsI–SiPM detector module, we optimized the readout circuit and successfully improved the resolution from 1.67 ns to 1.33 ns—an improvement of about 1 ns. Moreover, our tests indicate that the 1.33 ns is dominated mainly by the contribution from the crystal itself.

[DarkSHINE simulation]:

• Using a higher-statistics sample, we studied how the dark-photon signal significance depends on the ECAL energy resolution and the signal-box window (top plots, 10 MeV A'), and we also analyzed how this dependence changes after applying the HCAL cut (bottom plots, 10 MeV A').
  • Samples：baseline v1.0, inclusive + rare backgrounds. >1e15 EOTs for each rare background.
• 2.5 GeV ECAL cut looks reasonable in baseline v1.0.

[DarkSHINE ECAL prototype]:

• Modified the prototype’s mechanical structure by adding support posts between layers to prevent stress on the PCB. Holes will be drilled in the PCB so it can be mounted onto the support posts. 
• We’ve already shared this modification with the electronics team.

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Plans: 

• [STCF EMC] : Try to understand different factors in CsI crystal scintillator that can affect time resolution, using Geant4 optical simulation. 

11:15 → 11:25 Status

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

DarkSHINE

• We continued to conduct the uniformity test for the 75cm length scintillator
• The light output of the new scintillator test are smaller than those in the past
•  
• 
•  
• We will conduct uniformity test and get the ratio of non-uniformity rather than focusing on the specific amount of light production
  • Possible reasons :
  • Fibers: we have ordered new fibers and will be delivered this week
  • SiPM: we will try to use other SiPM to cross check

ATLAS HGTD

• Participated in the wafer test

11:25 → 11:35 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

 

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Today's focus: 

[ssWW]:

• Presented the EWK status report last Friday. 
• Presented the WZ_CR m_jj reweighting results yesterday (Tuesday) during the group meeting. Comments (made about the uncertainties of the fits and its propagation) have been adressed and shared on MatterMost.

[Hyy*]:

• AC shared a new n-tuple formalism dummy sample Monday on Mattermost. Yesterday, the data have been downloaded on /eos/. This allowed me to:
  • Testing my scripts are working (to continue the fake template task)
  • Check that the cutflow is exactly the same with new files(task requested by AC)
  • Run my script on the available files (only data for now):

• Shared with AC privately on Mattermost. Prelimiary result seems good enough to present for next GM (whatever the status of MC sample).

[ZZy]:

• Latest results and plot have been documented in a powerpoint, to summarize the efforts made during the past days/weeks.

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Plans: 

• [ssWW]: WZ_QCD reweighting closure plots have been validated[?], last step would be to implement the reweighting function inside FastFrames and focus on our next task: dim-8 EFT.
• [Hyy*]: New n-tuples should be ready soon. I will run my updated jobs on them right away.
• [VBS Kappa_Lambda]: Start working on this project, starting Thursday.

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

11:35 Status

Speaker: Peixu Teng (SPA, SJTU)

• LEP comparison 

For the LEP part, I used two inputs from Madgraph. One dataset was used to calculate the photon-cut efficiency, while the other provided the production cross section( e^-e^- ->N\nu). The cross section was then multiplied by the decay probability and the photon efficiency. The exclusion curve was reconstructed by requiring the visible cross section to reach the LEP single-photon reference limit of 0.1pb

This figure shows the photon-cut efficiency \varepsilon_\gamma in the (m_N,d) plane. It was obtained from the LEP single-photon sample by applying the photon energy and angular cuts, and calculating the surviving fraction of events.

This figure shows the photon-cut efficiency in the (m_N,d) plane. It was obtained from the LEP single-photon sample by applying the photon energy and angular cuts, and calculating the surviving fraction of events.

11:40 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

11:45 Status

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