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The Kinoshita–Lee–Nauenberg theorem or KLN theorem states that perturbatively the standard model as a whole is infrared (IR) finite. That is, the infrared divergences coming from loop integrals are canceled by IR divergences coming from phase space integrals. It was introduced independently by and . An analogous result for quantum electrodynamics alone is known as Bloch–Nordsieck cancellation. Ultraviolet divergences in perturbative quantum field theory are dealt with in renormalization. ==References== * * *Taizo Muta, Foundations of Quantum Chromodynamics: An Introduction to Perturbative Methods in Gauge Theories, World Scientific Publishing Company; 3 edition (September 30, 2009) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kinoshita-Lee-Nauenberg theorem」の詳細全文を読む スポンサード リンク
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