Shu's weekly group discussion

Wednesday 26 Mar 2025, 10:00 → 12:40 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://meeting.tencent.com/p/7659960274

#腾讯会议：765-996-0274

会议密码：2025

10:00 → 10:10 Status¶

Speaker: Jun Wei Lok (TDLI, SJTU)

10:10 → 10:20 Status¶

Speaker: Zelin Yan (TDLI, SJTU)

H2a4b_Zelin_update.pptx

10:20 → 10:30 Status¶

Speaker: Bai-Hong Zhou (TDLI, SJTU)

2025_03_26.pdf

10:30 → 10:40 Status¶

Speaker: Xuliang Zhu (TDLI, SJTU)

10:40 → 10:50 Status¶

Speaker: Zhiyu Zhao (TDLI, SJTU)

10:50 → 11:00 Status¶

Speaker: Danning Liu (TDLI, SJTU)

11:00 → 11:10 Status¶

Speaker: Qibin LIU (TDLI, SJTU)

11:10 → 11:20 Status¶

Speaker: Ngoc Khanh Vu (TDLI, SJTU)

11:20 → 11:30 Status¶

Speaker: Rui Yuan (TDLI, SJTU)

11:30 → 11:40 Status¶

Speaker: Tong Sun (TDLI, SJTU)

11:40 → 12:30 REU: Undergrad Research Discussions¶

11:40 Status¶

Speakers: Fengyi Jiang (ShanghaiTech Univ. (CN)), Sian Yang (ShanghaiTech University)

11:50 Status¶

Speaker: Peixu Teng (SPA, SJTU)

12:00 Status¶

Speaker: Linjing Duan (Sun Yat-sen University, Shenzhen Campus (CN) & TDLI/SJTU (CN))

12:10 Status¶

Speaker: Kang Yu (Jilin University(JLU) & TDLI/SJTU)

I have calculated tau lepton pair's spin correlation matrix after boosting four-momentum of its decay products pion+ and pion- to the rest  frame of tau+ and tau-, respectively.

 

For Reconstruction level, it shows

$\C_{ij}$	r	k	n
r	-0.5976	0.0407	-0.0238
k	0.0057	1.2479	0.0075
n	-0.0112	-0.0270	0.6173

And its concurrence is 0.7318.

Here is the distribution of angle between the momentum of pion and n-axis, which is used in the calculation of Asymmetry.

 

For the data generated  through ML, it shows

$\C_{ij}$	r	k	n
r	-0.0641	-0.0230	0.0299
k	0.0904	0.8288	-0.0278
n	-0.0154	-0.0291	0.0233

And its concurrence is 0 (-0.0488).  

Since tau lepton pair has the term of net polarization B in its density matrix, the entanglement calculated before is not exactly right.