CEPC LLP Taskforce

Thursday 7 Nov 2024, 13:30 → 15:30 Asia/Shanghai

会议链接(via 腾讯会议)： 
https://meeting.tencent.com/dm/QNy3aLDslNof 
#腾讯会议：685-5814-3836 

Minutes_CEPC_LLP_Taskforce_20241107.txt

Meeting Minutes for 2024.11.07 LLP Task force meeting

 

Present: Kechen, Zeren, Xiang, Cen, Liang, Manqi, Xuai, Xiaolong, Hengne, Jinhan

 

Kechen/Zeren:

1. Layered cavern surface tracker (LAYCAST) projection: Far detector can enhance LLPs search by 1-2 orders (no background)

2. Barrel region has better acceptance

3. Shielding plan needs to be understood

4. Compared to LLP in LHC, how to improve it?

5. Other new physics ideas

 

Xiang/Liang:

1. 100s per signal events in simulation, 60days for full simulation including background

2. Near detector: background free with AL, ~1 order improvement compared to LHC/HL-LHC

2. Far detector gain estimation: 1-2 orders (background free based on ND study)

 

Far detector discussion:

Manqi: Low ctau LLP has better performance in CEPC compared to LHC: contributions from main detector, need quantitative results for far detector gain (e.g. SJTU study)

Xiaolong: Need physics motivation/input for a better detector design (e.g. muon detector), not limited to LLP, other new physics searches? There are also proposal to do LLP test at Bell2.

Kechen/Zeren: Take a look at https://arxiv.org/pdf/1911.08721, also there are some quantitative results at https://arxiv.org/pdf/1911.06576

Xuai: No need to do full simulation + ML for TDR, rough estimation should be enough

Liang: Will try different configurations (Faser, Mathusla) and recalcuate FD gain factors

13:30 → 14:00 LLP theoretical models and corresponding LAYCAST projections

Speakers: Kechen WANG (CFHEP, IHEP) , Zeren Simon Wang (University of Bonn)

230704_Status of LLP Studies at Future Electron Positron Colliders.pdf

240408_Overview of LLP Studies at Future ee Colliders.pdf

241023_LAYCAST - a proposed detector for long-lived particle searches at the CEPC.pdf

241107_LLP用CEPC近端探测器(ND)和远端探测器(FD)的相关研究.pdf

14:00 → 14:30 CEPC new software framework test with LLP signal sample production

Speaker: Xiang Chen (Shanghai Jiao Tong University)

CEPC LLP Study.pdf

14:30 → 15:00 Far detector gain estimation based on ML studies

Speakers: Liang Li (Shanghai Jiao Tong University) , Xiang Chen (Shanghai Jiao Tong University) , 岑 莫 (Shanghai Jiao Tong University)

LLP_far_detector.pdf

15:00 → 15:30 Far detector discussion

Speaker: Manqi Ruan (IHEP)