Kinematic Singularity Structure of Amplitudes for a Four-Particle Process with One Massless Particle
- 25 December 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 176 (5) , 1782-1795
- https://doi.org/10.1103/physrev.176.1782
Abstract
For a two-to-two particle interaction, one of the particles being massless, we discuss and give the kinematic-singularity-free combinations of helicity amplitudes, the constraint equations, and an expression for invariant amplitudes in terms of helicity amplitudes. The constraint equations are obtained from an invariant-amplitude expansion rather than from the crossing matrix.Keywords
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