B衰变湮灭矩阵元的研究  

The Study of annihilation matrix element in B decay

作　　者：王小虎[1] 

机构地区：[1]烟台大学光电信息科学技术学院,山东烟台264003

出　　处：《黑龙江科技信息》2017年第6期172-174,共3页Heilongjiang Science and Technology Information

基　　金：烟台大学研究生科技创新基金资助~~

摘　　要：本文基于光锥求和规则计算了在2粒子3扭度领头阶下的B→ρπ的弱湮灭形状因子。我们在类时区域构造了一个解析的关联函数,通过强子部分与QCD部分相匹配,仅保留基态贡献,利用夸克-强子对偶原理去掉B→ρπ振幅中高激发态的贡献。通过Borel变换后我们得到在大的类空区域的B→ρπ的弱湮灭形状因子,然后推广到类时区域Q2=mB2,得到B→ρπ在类时空间的弱湮灭形状因子。using the method of QCD light-cone sum rule, we calculated B→ρπ weak annihilation form factors at two-particle and twist-2 leading order accuracy.Constructing a analytical correlation function in space-like region. Matching this relation to the result of QCD calculation, we retain only the pion contribution and replace the sum over heavier states by a quark-hadron duality estimate. After Borel transformation we obtain the LCSR for the weak annihilation form factors at large space-like Continuing it to large time-like , we get the weak annihilation form factors.

关 键 词：关联函数 跃迁矩阵元 湮灭 光锥求和规则 形状因子 

分 类 号：O572.2[理学—粒子物理与原子核物理]