重味b介子非轻弱衰变的唯象学研究

项目名称： 重味b介子非轻弱衰变的唯象学研究

项目编号： No.11205072

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 刘新

作者单位： 江苏师范大学

项目金额： 22万元

中文摘要： 重味b介子的非轻弱衰变研究对检验标准模型理论、研究CP破坏机制及探寻新物理信号有着非常重要的科学意义。在B工厂实验及LHC实验的强劲推动下，重味b物理成为最重要的前沿研究领域之一。重味b介子湮灭衰变机制有待深刻理解，p-波轻介子内部结构等QCD问题还需进一步探究。除大量B介子衰变道外，实验还将观测到更多的Bs和Bc衰变事例。重味b介子到两个末态强子的衰变过程，其理论误差主要来源于相关强子矩阵元的计算。pQCD因子化方法在解决端点发散，计算旁观者夸克图和湮灭图方面有明显的优势，并在唯象分析方面取得了显著成功。鉴于此，本项目研究内容为：基于pQCD因子化理论框架，在标准模型中，对重味b介子的非轻弱衰变过程进行系统研究，计算分支比和CP破坏等可观测物理量，为探索p-波轻介子内部结构提供新的场所，为唯象分析重味b介子实验数据并深刻理解重味b物理中的湮灭衰变机制提供理论支持。

中文关键词： 重味b介子；非轻弱衰变；pQCD因子化方法；QCD动力学；标准模型

英文摘要： Studies on nonleptonic weak decays of heavy b-flavored mesons, composed of heavy b quark and a lighter u, d, s or c quark, play very important roles in testing the theory of standard model, investigating the scheme of CP-violating asymmetries, and exploring the signals of exotic new physics. Strongly pushed by B factories(BaBar and Belle) and LHC(Large Hadron Collider) experiments, heavy flavor b physics becomes one of the very important frontiers in elemetary particle physics. It is the fact that the mechanism of annihilation decays of heavy b-flavored mesons needs understanding in depth and the QCD dynamics of light p-wave mesons such as the inner structure requires further investigation. Experimentally, besides plenties of decay modes of B meson, more and more decay events of Bs and Bc meosns will also be rapidly produced in the near future. Presently, large amounts of decay channels of heavy b-flavored mesons to two final state hadrons(e.g. light s-wave and p-wave mesons) have been detected, while the predictions on relevant physical quantities of these processes generally suffer from a few of theoretical uncertainties, which originate mainly from the evaluations of relevant hadronic matrix elements. As is well known that the perturbative QCD(pQCD) factorization approach has been employed extensively to trea

英文关键词： Heavy b-flavored mesons；Nonleptonic weak decays；pQCD factorization approach；QCD dynamics；Standard Model