题 目：Low energy scattering of J∕ψπ and J∕ψK systems
报告人：闫江（中国科学院理论物理研究所，博士后）
时 间：2026年6月10号（星期三）14:00
地 点：物理学院LE201
邀请人：郑绪昌
报告摘要：We study the low-energy interactions of $J/\psi$ with light pseudoscalar mesons, $J/\psi \pi$ and $J/\psi K$, within a dispersive framework. The symmetry-breaking terms in the chiral Lagrangian induce mixing between bare charmonium fields, which is removed by diagonalization to obtain the physical $J/\psi$ and $\psi'$ states. Based on the diagonalized Lagrangian, we construct the crossed-channel amplitudes and incorporate $\pi\pi$ and $K\bar{K}$ final-state interactions. By combining constraints from $\psi' \to J/\psi \pi\pi$ with the near-threshold continuation, we extract the scattering parameters. The obtained upper bounds, $a_{J/\psi\pi} \lesssim -0.0037$~fm and $a_{J/\psi K} \lesssim -0.049$~fm, indicate weak attractive interactions without bound states. The $J/\psi K$ interaction is enhanced relative to $J/\psi \pi$ due to explicit chiral symmetry breaking, while both channels remain dominated by the soft-gluon exchange mechanism.
闫江，中国科学院理论物理研究所博士后。2019年获得重庆大学物理学学士学位，2025年获得重庆大学物理学博士学位。随后在中国科学院理论物理研究所做博士后研究。主要研究方向为微扰QCD中重整化能标设定方法、色散关系方法在强子物理中的应用。目前已在JHEP、PRD等国际期刊上发表学术论文10余篇，主持国家自然科学基金理论物理专款项目。