Zeroing in on more photons and gluons

Details Zeroing in on more photons and gluons Zeroing in on more photons and gluons

1993-09-09

arxiv.org/abs/hep-ph/9309251v1

Phys.Rev. D49 (1994) 2290-2297

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages

Scientific paper

10.1103/PhysRevD.49.2290

We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multi-photon 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 single-photon 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 like gluon jet identification and computational checks is considered. We use examples to show how certain multi-photon 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.

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