【摘要】 介绍一种判断和计算圈图函数红外发散的有效方法 .利用该方法研究了C函数 (即三点圈图函数 )和D函数 (即四点圈图函数 )的红外发散性质 ,并且给出常见的C函数的红外发散形式更多还原

【Abstract】 A method to calculate infrared divergence of loop function is introduced. Using this method, we analysis the divergence property of three point loop function and get the criterion to judge whether there exists infrared divergence for three point functions. The explict forms of infrared divergence in some cases are obtained with mass regulation or dimension regulation. Such method can also be applied to four point loop functions.更多还原