The universal structure of large logarithms in scattering amplitudes and cross sections

by Prof. Jian Wang (Shandong University)

Thursday 14 Oct 2021, 15:00 → 16:00 Asia/Shanghai

S408

The scattering amplitudes and cross sections are the central objects in theories of fundamental interactions, and play special roles in testing any theory with experiments. Though there is significant progress in our understanding of their structures, it is still hard to calculate them precisely, especially for processes with multiple scales. However, they turn out to be dominated by large logarithms in the case that a large scale hierarchy exists. In the leading power factorization scheme, these logarithms are fully controlled by universal anomalous dimensions of effective operators. At subleading power, the factorization scheme is often plagued by end-point singularities. The anomalous dimension may also contain large logarithms in itself. It is of great importance to understand these new structures more deeply and clearly. 王健，2013年于北京大学毕业，获得博士学位，先后在德国美因茨大学和慕尼黑工业大学从事博士后研究工作，2019年起在山东大学工作。研究方向是粒子物理理论，主要包括量子色动力学高阶修正和寻找超出标准模型的新物理信号。 Tecent Meeting: https://meeting.tencent.com/dm/d4QT6Znqe9h9 Meeting ID：297 521 025