论文标题
QED中红外安全散射的着装要求
Dress code for infrared safe scattering in QED
论文作者
论文摘要
我们研究了量子电动力学中的一般穿着状态的$ S $ -MATRIX和包容性横截面。我们获得了一般着装状态的$ s $ -matrix元素的红外分解公式。它使我们能够研究哪种衣服状态导致红外线安全$ s $ - 马特里克体元素。穿着状态的条件可以解释为记忆效应，这只是渐近对称性的保护定律。我们为一般着装状态得出广义的软光子定理。我们还使用一般着装状态计算包容性的横截面。有必要使用适当的初始和最终着装状态来评估干扰效应，由于红外差异，无法通过使用Fock状态正确计算出干扰效应。
We study the $S$-matrix and inclusive cross-section for general dressed states in quantum electrodynamics. We obtain an infrared factorization formula of the $S$-matrix elements for general dressed states. It enables us to study what dressed states lead to infrared-safe $S$-matrix elements. The condition for dressed states can be interpreted as the memory effect which is nothing but the conservation law of the asymptotic symmetry. We derive the generalized soft photon theorem for general dressed states. We also compute inclusive cross-section using general dressed states. It is necessary to use appropriate initial and final dressed states to evaluate interference effects, which cannot be computed correctly by using Fock states due to the infrared divergence.
