Towards S-matrix theory of unstable particles

開催日時

2023/10/24 11:00 – 12:00

開催場所

オンライン(Zoom)

講演者

青木 勝輝 氏(京都大学基礎物理学研究所)

言語

English

詳細ページ

お問い合わせ

三浦 光太郎/kohmiura-AT-post.kek.jp


概要

The S-matrix is one of the central objects in quantum field theory and has gained renewed interest recently to better understand the possible structures of low-energy effective field theories, strongly-coupled systems, quantum gravity, etc. However, most of the particles have finite decay widths and thus do not appear in asymptotic states. Therefore, the standard S-matrix arguments may not be directly applied to scatterings of such unstable particles and we need to formulate “the S-matrix theory of unstable particles” to properly understand the availability of the S-matrix arguments in realistic systems. In this talk, I will talk about some progress towards this goal. In particular, I will discuss non-perturbative consequences of unitarity in scattering amplitudes of unstable particles and their analytic properties.