学术报告（11月2日 周五 下午14:00-15:30）

【摘要】

Drawing on experimental data for baryon resonances, Hamiltonian effective field theory (HEFT) is used to predict the positions of the finite-volume energy levels to be observed in lattice QCD simulations. We have studied the low-lying baryons N∗(1535), N∗(1440), and Λ(1405). In the initial analysis, the phenomenological parameters of the Hamiltonian model are constrained by experiment and the finite-volume eigenstate energies are a prediction of the model. The agreement between HEFT predictions and lattice QCD results obtained at finite volume is excellent. These lattice results also admit a more conventional analysis where the low-energy coefficients are constrained by lattice QCD results, enabling a determination of resonance properties from lattice QCD itself. The role and importance of various components of the Hamiltonian model are examined in the finite volume. The analysis of the lattice QCD data can help us to understand the structure of these states better.

 

【报告人简介】

 刘占伟，兰州大学物理系副教授，2008年本科毕业于兰州大学，2013年于北京大学获得理论物理博士学位，2013-2016年在澳大利亚阿德莱德大学从事博士后研究工作，于2016年9月在兰州大学工作至今。刘占伟博士主要从事粒子物理唯象学和有效场论方面的研究，如重子共振态方面等，目前已发表学术论文二十多篇。