Chib0湮灭形状因子的α_S^0υ~2阶计算

这篇文章利用非相对论量子色动力学(NRQCD)有效理论对强相互作用过程Xb0→J/ψ+γ的衰变宽度作了领头阶相对论修正即(αS^0υ^2)阶的计算。计算的主要方法及原理是利用NRQCD因子化定理把衰变宽度因子化成系列的长程矩阵元和短程系数相乘的形式。长程矩阵元是一个普适量可由实验得到,因此我们只需要微扰计算短程系数。

The leading order relativistic correction(αS0υ2)of the decay width of Xb0→J/ψ+γbased on nonrelativistic quantum chromodynamics(NRQCD)is calculated in this paper,In virtue of NRQCD factorization theorem,the decay width be able to factor into a series of long range matrix elements and short range coefficient.The long range matrix element is a general amount that can be obtained experimentally.The main work is to calculate the short-range coefficients for perturbation.