重味重子衰变的唯象研究

Heavy baryons physics is currently a popular topic in particle physics. The study of this area is essential to test the Standard Model and to explore new physics. On the side of theory, the physical processes where heavy quarks are involved are greatly simplified and hence are ideal for studying nonperturbative strong interaction and new physics; on the side of experiments, there are currently some international large laboratories which are collecting more and more data for heavy baryons (for example, the B factories and LHC which are in operation). This will promote the study in this area greatly. In this project, based on our previous work we will study structures and properties of heavy baryons which contain one and two heavy quarks in the Bethe-Salpeter equation approach and potential model. The rare decay is of guiding significance to the discovery of new physics.

重味重子物理是目前粒子物理界的热点。这一领域的研究对检验标准模型和探索新物理具有重要意义。理论方面，重夸克参与的物理过程可以被极大地简化，是研究非微扰强相互作用和新物理的理想区域；实验方面，国际上一些大的实验室正在并将收集到更多有关重味强子的数据（如目前正在运行的B介子工厂和LHC）。这将极大地促进该方向的研究。本项目将在原有的工作基础上，利用Bethe-Salpeter方程和势模型研究包含一个和两个重夸克的重味重子的性质，其中涉及的稀有衰变对新物理的发现有一定的指导意义。

重味重子衰变是目前粒子物理界的热点。本项目将在原有的工作基础上，利用Bethe-Salpeter方程和势模型研究Lambda(b)稀有衰变的相关性质，对新物理的发现有一定的指导意义。论文主要涉及Lambda_b → Lambda l^+ l^- (l= e, mu, tau)这个衰变道的衰变宽度，衰变分支比，已经衰变过程的各种不对称参数。此外我们还分析计算了Lambda(b) →N l^+ l^-和 Lambda(b) →N γ 这两个衰变道。这些工作对未来实验的测量具有一定的指导意义。在这些方面取得了积极的进展。得到了一系列有新意的研究成果。本项目在国际物理一流杂志发表论文3篇。