10.29
The application of the nuclear structure theory in the neutrino related physics
报告人：
Dr. Xiaobao Wang（王小保）, 湖州师范大学
时 间：
星期三 2025-10-29 12:00 - 13:30
地 点：
Room 603, No.5, New Buildings of Sciences
Tencent Meeting：
https://meeting.tencent.com/dm/Bg7LrSR6acNu
ID: 571825091 password: 123456
摘 要：
In this seminar talk, I will present several of our previous works that focus on neutrino physics but are conducted based on nuclear structure theory. First, I will discuss the 'reactor antineutrino anomaly’, primarily addressing microscopic corrections to the treatment of beta decays. Next, I will introduce our work related to neutrinoless double beta decay, which involves comparisons between shell model and ab initio calculations.
Finally, I will present the calculation results of the neutral current neutrino cross section at supernova energies for 40Ar using the shell model.
报告如有变动，请查看：
https://tdli.sjtu.edu.cn/event/4495
10.29
Scattering amplitudes in gauge theories
报告人：
Dr. Kaoru Hagiwara, KEK
时 间：
星期三 2025-10-29 13:30 - 15:00
地 点：
Tsung-Dao Lee Institute/N6F-N600-Lecture Room
Tencent Meeting：
https://meeting.tencent.com/dm/g6UiIqbCd3EG
ID: 604188175
摘 要：
In quantum field theories, scattering amplitudes are calculated perturbatively by using the plane wave solustion of the equation of motion of participating particles and its Green's functions (propagators). In gauge theories, Green's functions for the gauge particles are found only after gauge fixing. The most popular method is covariant gauge fixing, including Feynman, Landau and R_\xi gauges. The common feature among all covariant gauges is to constrain the total derivative of gauge fields, \del_mu A(x)^\mu. Accordingly, all four helicity components of virtual gauge bosons are allowed to propagate (three in Landau gauge) in each Feynman diagram, leading to subtle cancellation among interfering diagrams to obtain physically observable scattering amplitudes.
In this seriese of four lectures, I will introudce the Feynman Diagram (FD) gauge, in which the scalar component of the helicity states of virtual gauge bosons are not allowed to propagate (in case of massless gauge bosons of QED and QCD), or replaced by the Goldstone boson (in case of massive weak bosons). We have modified the helicity amplitude calculation code (HELAS) inside MadGraph that allows us to obtain arbitrary tree-level scattering amplitudes in the FD gauge, for the SM and BSM models with SMEFT operators. No subtle cancellation among interfering amplitudes remain, and we can understand how individual diagrams interfer.
It is clear that the FD gauge allows us to obtain physical amplitudes for each individual Feynman diagram. We do not yet know why this is the case. I would like to explain my own thoughts on the problem, and how it can contribute to the radiative correction frameworks of the SM, QCD and the EW theory.
报告如有变动，请查看：
https://tdli.sjtu.edu.cn/event/4497
10.29
Universe Hot Baryon Surveyor
报告人：
Dr. Wei Cui（崔伟），Tsinghua University
时 间：
星期三 2025-10-29 14:00 - 15:00
地 点：
Tsung-Dao Lee Institute/N6F-N601-Meeting Room
Tencent Meeting：
https://meeting.tencent.com/dm/jQE8afGFpnCq
Meeting ID: 354391826 (no password）
摘 要：
Hot Universe Baryon Surveyor (HUBS) is a proposed space-borne observatory for X-ray astronomy. The primary scientific objective of the mission is to fill a void in probing the ecosystem of galaxies and thus to advance our understanding of cosmic structure formation and evolution, which is of fundamental importance. More specifically, HUBS aims at directly detecting soft X-ray emission from diffuse gas of temperature exceeding 106 K, which is theoretically postulated to permeate the large structures in the cosmic web and also fill the extended halo of galaxies. However, although some indirect evidence exists, the presence of such hot gas has yet been well established observationally, due to the lack of effective tools to probe it. In this talk, I will describe the design of HUBS, focusing on its scientific payload, which employs cutting-edge superconductor technologies, and on the progress of the development.
报告如有变动，请查看：
https://indico-tdli.sjtu.edu.cn/event/4512
10.29
物质中的对称破缺和拓扑缺陷
报告人：
Dr. Qihe Wei（韦齐和），南方科技大学
时 间：
星期三 2025-10-29 15:00-16:00
地 点：
Room 300, No.5, New Buildings of Sciences
摘 要：
拓扑缺陷是对称破缺的重要标志；广泛存在于有序体系中，从初生宇宙到多种凝聚物态，从指掌纹到集群的细胞。拓扑缺陷对物理系统的多种物理特性有着决定性的影响。本报告将从拓扑缺陷的定义和数学描述出发，以铁电向列液体和细菌-液晶活物质为例，介绍其在取向有序物态里的结构、与边界条件和系统对称性的关系、以及对非平衡态运动的影响。
报告如有变动，请查看：
https://www.physics.sjtu.edu.cn/index_report_colloquium/3934.html
10.30
Solar Neutrinos after Borexino: Current Results and Future Prospects with JUNO
报告人：
Dr. Joao Paulo Pinheiro, TDLI
时 间：
星期四 2025-10-30 11:00 - 12:00
地 点：
Tsung-Dao Lee Institute/N6F-N600-Lecture Room
Tencent Meeting：
https://meeting.tencent.com/dm/j1BdkQvK9394
ID: 494129789 password: 123456
摘 要：
The Borexino experiment has changed permanently our knowledge on solar neutrino spectroscopy, achieving the first real-time detection of pp, pep, 7Be, and CNO neutrinos. Our detailed analysis of Borexino Phase-II and Phase-III data provides robust measurements of these fluxes, offering powerful tests of Standard Solar Models and stringent constraints on new physics scenarios like neutrino non-standard interactions and magnetic moments. In this talk, I will present these state-of-the-art results and discuss how they set the stage for the next-generation Jiangmen Underground Neutrino Observatory (JUNO). With its precise energy resolution and high statistics, JUNO will improve the precision of solar neutrino measurements, opening new windows to probe solar metallicity and physics beyond the Standard Model.
报告如有变动，请查看：
https://tdli.sjtu.edu.cn/event/4508
10.31
Lectures on QFT anomalies
报告人：
Dr. Thors Hans Hansson, Stockholm University
时 间：
星期五 2025-10-31 10:00 - 11:30
地 点：
Tsung-Dao Lee Institute/N6F-N600-Lecture Room
Tencent Meeting：
ID: 410445746
摘 要：
Prof. Hansson will give a general introduction to QFT anomalies with a minimum of technicalities, and then to illustrate their importance with a few examples from modern condensed matter physics.
报告如有变动，请查看：
https://tdli.sjtu.edu.cn/event/4513
编辑：叶丹
责任编辑：张小丽
