Infrared photons and asymptotic symmetries
arXiv:2107.03240 · doi:10.1016/j.physletb.2021.136698
Abstract
S-matrix elements exhibit universal factorization when multiple infrared photons are emitted in scattering processes. We explicitly show that the leading soft factorization of tree-level amplitudes with the emission of any number of soft photons can be interpreted as the Ward identity of the asymptotic symmetry of gauge theory.
arXiv comment10 pages, v2: minor revision with several issues clarified and comments added, typo corrected
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