强子物理在线论坛 Hadron Physics Online Forum (HAPOF)
第一百零二期HAPOF论坛，Effective range expansion with the left-hand cut，杜孟林 教授，2024年09月13日
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Asia/Shanghai
Description
报告人：杜孟林 教授（电子科技大学） 报告时间：2024年09月13日 15：00 - 17：00 (北京时间) 会议链接：点击链接 腾讯会议室ID: 105-279-428 摘要： We extend the effective range expansion to incorporate the left-hand cut arising from the one-particle exchange. The traditional effective range expansion is only valid in a very limited range if a left-hand cut is located close to the two-particle threshold. Such a left-hand cut arises in the two- particle interaction involving a light particle exchange with a mass small or slightly heavier than the mass difference of the two particles, a scenario encountered in a wide range of systems. This can hinder a precise extraction of low-energy scattering observables and resonance poles. To address this issue, we propose a new parameterization for the low-energy scattering amplitude that accounts for the left-hand cut, enabling its application to a broad class of scatterings and potentially relevant near-threshold hadronic states. As byproducts, we also show that the parameterization can be used to extract the couplings of the exchanged particle to the scattering particles, and derive expressions for amplitude zeros caused by the interplay between the short- and long-range interactions. 报告人简介： 杜孟林，电子科技大学物理学院教授。2005-2009年就读于武汉大学物理系，2009-2012年就读于北京大学理论物理专 业，2014-2017年于德国波恩大学攻读博士学位，随后分别在德国波恩大学HISKP和西班牙瓦伦西亚大学IFIC做博士后 研究，2022年加入电子科技大学物理学院。主要从事理论粒子物理研究，兴趣包括强子物理和强相互作用、粒子物理唯象 以及新物理。 特别鸣谢：本届论坛由彭桓武理论物理创新研究中心支持。
