衰变宽高阶修正的计算

文章研究了重夸克偶素产生以及衰变过程η_b→J/Ψ+γ形状因子的相对论修正。文章将使用非相对论量子色动力学有效理论(NRQCD)计算其修正,非相对论量子色动力学有效理论(NRQCD)能将一个本来不可算的过程因子化成一系列短程系数和长程矩阵元的乘积。短程系数可以进行微扰计算而各个长程矩阵元虽然是不可计算的但是它是普适的,只需要参照其他文献的数据带入使用就可以,从而使η_b→J/Ψ+γ高阶修正的衰变宽度变为可算的。

This paper deals with the relativistic correction to the shape factor of ηb→J/φ＋γ in the process of heavy quarkoniumproduction and decay. In this paper,the non-relativistic quantum chromodynamics theory （NRQCD）is used to calculate its correction. The non-relativistic quantum chromodynamics theory （NRQCD） can convert an otherwise incalculable process factor into theproduct of a series of short-range coefficients and long-range matrix elements. The short-range coefficient can be calculated by perturbation and each long-range matrix element is not computable,but it is universal,so it can be used only by referring to the dataof other literature. Thus,the higher order corrected decay width of ηb→J/φ＋γ becomes computable.