Bs介子弱衰变过程的唯象研究及新物理探索

With the running of LHCb, more Bs meson decays will be measured precisely, and more physical phenomena will also be discovered. So, Bs physics will be one of the important directions on the research fields of heavy flavor physics in the next few years. We will consider the effects of the various new physics model(such as the forth generation, 2HDM, Z'model, etc.) on the observable physical quantity of Bs meson decay processes, with the help of some experimental results which can be measured precisely, the strict constrains on the new physics model parameters will be given out. Meanwhile, for some Bs meson decay processes, there are larger deviations between the experimental measurements and theoretical predictions in the standard model, we expect to look for possible explanation through new physics model. This project have the important meaning in some terms，such as looking for the origin of CP violation, testing the standard model and looking for the indirect signal of new physics, etc.

随着LHCb的运行，更多的Bs介子衰变道将被精确测量，也将有更多的物理现象被发现。因此，在未来几年，Bs物理将是重味物理研究领域的重要方向之一。在本项目中，我们将考虑各种新物理模型（例如第四代模型、双Higgs模型、Z'模型等）对Bs介子弱衰变过程可观测物理量的影响，借助于精确测量的实验结果，对新物理模型参数进行严格限制。同时，对于一些实验上测量和标准模型理论预言有较大偏差的衰变道，通过新物理模型寻求可能的解释。本项目的研究在寻找CP破坏的起源、检验标准模型和寻找新物理间接信号等方面具有重要意义。

随着LHCb的运行，B_{s} 物理将是重味物理领域重要的研究方向之一。在项目一年的执行过程中，我们在双希格斯二重态模型（Type -I 、Type-II 和Type-III）下，对半轻衰变过程B_{s}\phi\mu^{+}\mu^{-}的双轻子极化不对称问题进行了研究。同时，我们也在第四代模型下对重子的半轻衰变\lamda_{b}\lamda\mu^{+}\mu^{-}进行了研究。项目基本上按计划进行，目前已撰写论文1篇。