Shu's weekly group discussion

Wednesday 21 Jan 2026, 10:00 → 13:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N631 - 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 → 10:10 Status

Speaker: Kang Yu (TDLI, SJTU)

Grade:

Quantum Field Theory: A

Advanced Quantum Mechanics: A+

Fundamentals of Particle Physics and Nuclear Physics: A-

Frontiers of Particle Physics: B+   (really sorry for failing professor's expectations)

Group Theory: --

Nuclear Electronics: --

Computation Method in Particle Physics: --

 

1. Review the adjoint representation of Lie algebra and understand Dynkin index.
2. After exam weeks, I take some rest.
3. Plan: finish SiPM experiment report before Jan. 25th, and finish another course report of Geant4 simulation and analysis before Jan. 30th.

10:10 → 10:20 Status

Speaker: Linjing Duan (TDLI, SJTU)

10:20 → 10:30 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

IV curve characteristics of two SiPM (same type:S14160-3010PS) is measured at 20C.

A piecewise linear fitting approach was implemented. Two linear regressions were performed on the log(I)-V curve:
The Breakdown Voltage was the intersection point of these two linear segments.

IV curve of SiPM1

IV curve of SiPM2

 

 

 

 

 

 

10:30 → 10:40 Status

Speaker: Zelin Yan (TDLI, SJTU)

Zelin_update.pptx

10:40 → 10:50 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

• Finished:
  • Zbbj Calibration:
    • Used the simplified workspace to derive the preliminary fitting results (only include 3 main systematics);
    • Current results: mu = 1.255 +/- (-0.290.291) [Full Syst.] = 1.255 +/- (-0.266, 266) [Stat. Only];
  • ssWWjj:
    • Checked the yields and variables distributions for MC23 for Signal Region;
  • Hyy*:
    • Checked the assymetry impact for mu from the large theory unc. (ATLAS_Scale_nlo);

• Plan:
  • Zbbj Calibration:
    • Add the full set of systematics to our fitting;
  • ssWWjj:
    • Begin to have a look at the WZ QCD bkg with Matthias;
  • Hyy*:
    • Wait for the updated for the workspaces from Laura;

10:50 → 11:00 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:00 → 11:10 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

DarkSHINE：

• Last week: Implemented ECAL unit resolution formula into DarkSHINE software digitization tool
• This week: tested the energy dependence of the HCAL unit resolution using the same method as ECAL, and the data are currently being processed

11:10 → 11:20 Status

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

CEPC

• Finished the sample production for the background processes
• Now I am checking the jet tagging efficiency from previous work of Manqi to see if we adopt it for our analysis

DarkSHINE

• Working on the HCal R&D note: Polishing the text and inserting figures I received from Chunxiang

11:20 → 11:30 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

11:30 → 12:25 REU: Undergrad Research Discussions

11:30 Status

Speaker: Peixu Teng (SPA, SJTU)

2026_1_21 (1).pdf

This is a part of the problem, But not all

ヽ(≧□≦)ノ

11:35 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

I collected 1012 waveforms and superimposed all waveforms into a single graph. To reduce errors and improve resolution, I determined the baseline based on the interval from -500 ns to -200 ns for each waveform. Then I integrated the data from the -50 ns to 250 ns interval after subtracting the baseline value, resulting in this energy spectrum.

            

To ensure that I could independently complete a full set of experiments, I carried out preparations for several key pieces of equipment. Included wrapping an LYSO crystal with reflective film, soldering a circuit board and designing and 3D-printing a mold to secure and align the crystal with the circuit board.

• wrap the LYSO crystal with reflective film

• solder circuit board

• 3D-print a mold

Next week's plan: measure the intrinsic radioactivity of the crystals (sizes: 25×25×25 mm³ & 25×25×100 mm³) using my self-prepared experimental setup.

11:40 Status

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