CEPC Flavor Physics Discussion

Friday 23 Sep 2022, 10:30 → 13:00 Asia/Shanghai

Overleaf link of CEPC Flavor White Paper for co-editing:
https://www.overleaf.com/6544624919ndzjrvxdcbzb

Relevant documents (e.g. minutes, slides, references...) can be found at:
https://docs.ihep.ac.cn/link/AAB56818007D3A46D8839ABDB81124C410

Zoom link:
Topic 主题: CEPC Flavor White Paper Discussion
Meeting ID 会议号: 87329319703
Begin Time 开始时间: 2022-09-23 10:00:00
Duration 持续时长: 180
Meeting URL 会议链接: https://ihep-ac-cn.zoom.us/j/87329319703?pwd=M2pJaDh5YmtsK09hYmM2dWh3cmxydz09
HostKey 主持人密钥: 237935
Password 会议密码: 589876
Timezone 时区: Asia/Shanghai

Minutes for CEPC Flavor White Paper Discussion

Date: 2022.09.23 10:30-12:30 (Beijing time)

Participants (14): Xuai Zhuang, Zhijun Liang, Bo Liu, Yongfeng Zhu, Tao Liu, Anson, Lorenzo, Liming Zhang, Lingfeng Li, Fengkun Guo, Chunhui Chen, Manqi Ruan, Hanhua Cui, Yuexin Wang

Indico page: https://indico.ihep.ac.cn/event/17871/

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Talk by Xuai: Briefing on CEPC New Physics White Paper

• Currently still little overlap between BSM & Flavor physics
• Suggestions
  • e.g. axion-like particles (ALP) at low mass scale
  • Lingfeng can offer more refs.

Talk by Bo & Zhijun: Briefing on CEPC Electroweak White Paper

• Timeline: maybe the end of 2022 to 2023
• EW via Z→ττ channel
  • Most relevant to flavor physics, also have available sample and technology of tau reconstruction
  • Current status
    • Just pheno work, fast simulation projection
    • Need further full simulation study, systematic control issues…
• Similar work by Siqi Yang & Zhenyu Zhao
  • Try to invite them to make more efforts
  • Maybe a talk in our next discussion
• W mass
  • Direct measurement?
    • systematic control issues
  • Flavor anomaly from W mass deviation?
    • Difficult from theoretical perspective
    • Theory/model dependent

Talk by Lingfeng: Briefing on CEPC Flavor White Paper

Try to find golden flavor studies to exploit the three main advantages of CEPC:

• Clean environment
• Excellent detector performance
• m_Z >> m_f

Talk by Yongfeng: CEPC vertex reconstruction performance

Q1:Track energy distribution of different cases classified by the track number? Does it affect the vertex reco. performance?

A1:Need further study to quantify.

Q2: How to understand the influence from the distance of hadron endpoint to IP?

A2: The closer the hadron is to the IP, the more likely they are to be assigned to the IP. Those hadrons with distances to the IP smaller than some threshold are not used to reconstruct the secondary vertex.

10:30 → 10:50 CEPC New Physics White Paper

Speaker: Xuai Zhuang (高能所)

Xuai-BSMatCEPC-WhitePaperStatus-20220923.pdf

10:50 → 11:10 CEPC Electroweak White Paper

Speaker: Zhijun Liang (IHEP)

CEPC_EWK.pdf

11:10 → 11:30 CEPC Flavor White Paper

Speaker: Lingfeng Li (Brown University)

Flavor_Progress_eeFact.pdf

11:30 → 11:50 CEPC Vertex Reconstruction Performance

Speaker: Yongfeng Zhu

CEPC vertex reconstruction performance.pdf