BES3实验中Ds强子末态衰变和Lambda_c重子自旋的精确测量

粲介子的半轻衰变和非轻衰变的精确测量可为测量CKM矩阵元提供重要参数，它对寻找超出标准模型的新物理有重要帮助。利用BES3实验获取的世界上最大的粲介子数据样本， 我们将对D介子衰变末态含标量和轴矢量粒子的半轻衰变开展研究，在Ecm= 4180MeV能量点，通过e+ e-→Ds± Ds*∓ 过程，开展Ds介子四体衰变的分波分析和Ds介子的单举强子衰变Ds→ωX的实验研究，检验CKM矩阵的幺正性。 同时我们还将利用BES3实验在Ecm=4.6GeV 处产生的Lambda_c/Lambda_c bar高统计量数测量Lambda_c粒子的自旋，检验夸克模型理论预言。

The precise measurement of the semi-leptonic decay and non-leptonic decay of the charm meson can provide important parameters for the measurement of the CKM matrix element, which is of great help for finding new physics beyond the standard model. Using the largest charm meson data samples obtained from the BES3 experiment, we will study the semi-leptonic decay of the D meson which include the scalar and axial vector particles in the final state, and at Ecm = 4180MeV energy point, for e+ e- to Ds + Ds* process, using partial wave analysis method to study the four body decay of the Ds meson and the inclusive hadronic decay process of Ds meson ,Ds→ωX, The unitary properties of the CKM matrix are examined. At the same time, we will also use the high statistic Lambda_c/Lambda_c bar data taking at Ecm=4.6GeV by BES3 experiment , to measure the spin of the Lambda_c particle, and to test the prediction of the quark model theory.