BESIII实验上粲重子Lambda_c衰变到含中子末态的研究

粲重子的衰变研究是粒子物理学家获取强子内部结构信息，认识弱作用规律的重要途径，在粒子物理理论研究和实验研究中都具有非常重要的作用。粲重子Λc有一半的概率衰变到含中子的末态，然而包含中子的大部分过程在实验上还没有得到测量。项目拟利用BESIII实验上高统计量的Λc数据，可以对粲重子Λc半轻衰变Λc+→nKS e nue 和Λc+→n e nue以及含中子/Σ-末态的强子衰变展开寻找与测量。这可以为理论模型提供重要的参数输入和约束，对检验标准模型亦有重要意义。BESIII实验测量此类物理过程具有独一无二的优势, 可以保证我们所研究的工作是世界上相关领域的首次测量或者最精确测量，具有创新性和领先性。

Study of the decay of charm baryons is of great important in the flavor changing physics due to their ability to provide useful information on the quark structure of the hadrons and reveal the nature of the weak interactions, which is an important topic for both theoretical and experimental particle physics. Half of the Λc decay to a neutron-containing final state, yet most of the these processes have not been experimentally measured. Using the high-statistics Λc samples recorded by from BESIII detector, we can search for the semi-leptonic decay of Λc+→nKS e nue and Λc+→n e nue and hadronic decay to the final states involved neutron and Σ hyperon. Such study can not only provide and constrain important parameters for the theoretical model, but also have significant meaning to test the standard model. BESIII experiments have unique advantages on such physical processes and ensures that the work we are researching is the first or most accurate measurement in the relevant field in the world, being innovative and leading.