Shu's weekly group discussion

Wednesday 11 Mar 2026, 09:25 → 13:00 Asia/Shanghai

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

Matthias Tartarin (TDLI/SJTU)

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

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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)

Today's focus: 

       [CEPC Zvvy nTGC ]:

• Consider the systematics for this analysis. Divide them into signal systematics and background systematics.
• Signal systematics may include
  • theoretical uncertainty
  • luminosity uncertainty
  • detector effects (object reconstruction and identification)
  • energy scale and resolution.
• Background systematics may include
  • background normalization uncertainty
  • background modelling effects.
• Read the nTGC Zννγ theory paper and the Zlly FOP paper as references for the draft.

      [Hyy* ]:

• The lowmass lly background templates for prompt leptons have been produced in the new h004 workspace
• The spurious signal test has been performed with the same setup.

Plans:

• CEPC
  • To apply up/down variations for each systematic source and take the change in yield as the systematic uncertainty.
  • These uncertainties will then be included in the EFT fit as nuisance parameters.
  • Wait for Danning’s fitting results to check possible improvements to the sensitivity.

• Hyy*
  • Study the fake background modelling, mainly from non-prompt leptons.

 

 

 

10:25 → 10:35 Status

Speaker: Jun Wei Lok (TDLI, SJTU)

10:35 → 10:45 Status

Speaker: Zelin Yan (TDLI, SJTU)

10:45 → 10:55 Status

Speaker: Bai-Hong Zhou (TDLI, SJTU)

10:55 → 11:05 Status

Speaker: Xuliang Zhu (TDLI, SJTU)

11:05 → 11:15 Status

Speaker: Zhiyu Zhao (TDLI, SJTU)

11:15 → 11:25 Status

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

11:25 → 11:35 Status

Speaker: Matthias Tartarin (TDLI, SJTU)

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Today's focus: 

[ssWW Analysis]:

• Following last week's issue regarding negative weights after the use of FastFrame (cf left plot), Baihong suggested a quick fix until the new samples produced with Easyjet are ready (cf right plot):

            (left)            Weight for the variable M_jj (WZ QCD bakcground)                      (right)

 

• This allowed to test the code developped during past weeks :

                                        (left: My plot)                                                               (right: from Legacy analysis paper ATL-COM-PHYS-2021-999)

which is quite different from the behavior presented by the legacy analysis (see plot at the right). But it is expected: We are using Run-3 pseudo-data, and with undefined 3rd lepton scale factor.
 

• On the subject of Run-3 pseudo-data, I used Baihong's cloned easyjet project, to produce the new mc23 samples : 147 files (140: done; 5 broken; 2 finished). 
  Investigating the broken one, and built an automatic script to download the files directly to /lustre/collider/xxx . It works, and is ready to share, if anyone is interested = "No need to have the terminal opened during the downloads".

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Plans: 

• [ssWW] Continue the production of mc23 samples, and wait for the production of mc20 (by Baihong) to:
  • Compare the total yields to Run2 legacy.
  • Reweight the WZ QCD samples following the legacy analysis method.
  • And to present it to the analysis group.

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

11:35 Status

Speaker: Peixu Teng (SPA, SJTU)

11:40 Status

Speaker: Zhijing Zhang (CCNU & TDLI/SJTU)

Remaining Updates of LYSO Crystals.pptx

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Today's focus:

• Learn about the ECAL of STCF from papers.
• Get familiar with the OSCAR ( Offline Software of Super Tau-Charm Facility ) framework.
• Run OSCAR simulation and obtain the response and resolution performance for photons.

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Plans:

• Start the simulation of the beam test (based on OSCAR).
• Compare it with the data obtained from the beam test.

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11:45 Status

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