微扰计算 meaning in English

perturbation calculus

Integral processing for the sum of infinite series in mbpt calculation
积分方法处理多体微扰计算中无穷项求和问题
Qcd is the fundamental theory of strong interaction . however , the perturbative calculation in qcd is only available at high energy . the hadrons belong to intermediate and low energy area
一般来说： qcd是研究强相互作用的基本理论，但qcd中的微扰计算方法只有在能量很高的情况下才适用，而对于中低能强子物理是无能为力的。