1993/09/09 by Robert W. Brown, R. W. Brown, M. E. Convery +2
Physics and Astronomy · #Amplitude #Decoupling (probability) #Gluon #High-Energy Particle Collisions Research #Massless particle #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Quark #hep-ph
paper · pdf · doi:10.1103/physrevd.49.2290
published as Phys.Rev. D49 (1994) 2290-2297 · 26 pages
arxiv created 1993/09/09 · openalex publication_date 1994/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multiphoton emission. Previous results are clarified by examples and by further elaboration. The conditions under which such amplitude zeros occur are identical in form to those for the singlephoton zeros, and all radiated photons must travel parallel to each other. Any other neutral particle likewise must be massless (e.g., gluon) and travel in that common direction. The relevance to questions such as gluon jet identification and computational checks is considered. We use examples to show how certain multiphoton amplitudes evade the zeros, and to demonstrate the connection to a more general result, the decoupling of an external electromagnetic plane wave in the "null zone." Brief comments are made about zeros associated with other gauge-boson emission.