One of the main issues posed by the presence of hadrons in any reaction is their final-state interactions, which are formally expressed in terms of the unitarity of the amplitude. In two-body scattering, unitarity is usually imposed in the direct channel only, as one is not sensitive to the details of the crossed channels. This is certainly not the case for a three-body decay, where the three possible two-hadron channels are physical, and one ideally wants to impose unitarity in all channels at once. The Khuri-Treiman formalism is a dispersive approach which indeed allows one to do so. In this talk, I will introduce such formalism and study various important applications, e.g. V→3π (V=ω,ϕ,J/ψ).

报告人简介：
Sergi Gonzalez-Solis is a Serra Húnter Fellow working in strong interactions at the Institute of Cosmos Sciences at the University of Barcelona. He obtained his PhD at the Institute of High Energy Physics at the Autonomous University of Barcelona in 2016. He has been postdoctoral PIFI Fellow at the Institute of Theoretical Physics of the Chinese Academy of Sciences (2016-2018), postdoctoral research associate at Indiana University (2019-2021) and Director's Fellow at Los Alamos National Laboratory (2021-2023). He is a member of the JPAC and REDTOP collaborations and have existing relationships with experimental collaborations such BESIII, CMS, GlueX, KLOE and MAMI.
His primary research is focused on the field of low energy hadronic physics.
Using Effective Field Theories and dispersion relations he pursues studies of hadron properties and interactions. While investigations in this field are important to understand the nature of QCD, they are also crucial for the quest for New Physics. Recently, he has become interested in searching for signals of new fundamental particles beyond the Standard Model in hadronic processes, such axions or dark photons.

邀请人：

郭奉坤 研究员