重味夸克衰变的研究

项目名称： 重味夸克衰变的研究

项目编号： No.10805037

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 李营

作者单位： 烟台大学

项目金额： 18万元

中文摘要： 重味物理作为检验标准模型，寻找新物理，探寻CP 破坏起源的重要场所，成为当前粒子物理中最前沿的课题之一。在该基金的支持下，我们该领域内做了以下工作: (1)新物理效应 我们在Z'模型、普适额外唯模型与Unparticle模型研究了一些特殊的衰变模式。通过与标准模型计算结果的比较，我们计算一些对新物理比较敏感的可观测量，它们可以在B工厂和LHC-b上得到测量。 (2)phi-omega混合 我们考虑了phi-omega的混合效应成功解释了Belle实验上发现的B- - >J/Psiphi 疑惑；并指出phi-omega的混合改变B- - >phi pi的分支比与直接CP破坏。 (3)高激发态粒子与标量粒子的研究 利用微扰QCD方法和夸克模型，我们计算了B介子到高激发态粒子的形状因子以及相关的半轻衰变模式；这些计算对于我们了解高激发态粒子的夸克组成有重要的意义。 (4)微扰QCD方法的推广与应用 一方面通过计算稀有衰变道的分支比以及直接CP破坏在实验上检验标准模型，另一方面利用实验数据抽取标准模型中的物理参量，如CKM矩阵元等。

中文关键词： B衰变；新物理；微扰QCD ；标准模型

英文摘要： Heavy flavor physics plays an important role in high energy physics, as it provides a good place for studying the fruitful dynamics of QCD, testing the Standard Model, investigating the CP violation, and probing new physics. Under the support of this founding, we have finished some works as follows: (1) Effect of New Physics We explored some decay modes with many new physics models involving the family non-universal Z' model, universal extra dimension model, unparticle model. By comparing the results with predictions of SM, we calculated some observables which could be measured in B factories and LHC-b experiments. (2) phi-omega mixing With phi-omega mixing, we had explained the Belle's results successfully. We predicted large branching ratio and CP asymmetries of B->phi pi with this kind of effect. (3) Excited states and Scalars Using quark model and PQCD approach we calculated the form factors and some semi-leptonic B decays, which help us to understand the characters of those particles. (4) Application of PQCD Within the PQCD approach, we could test the SM and QCD by calculating the branching ratios and CP asymmetries. On the other hand, we also extract the some parameters of SM, such as Vub, by comparing with experimental data.

英文关键词： B Decay; New Physics; perturbative QCD; Standard Model