Simplifying algebra in Feynman graphs. Part 2. Spinor helicity from the space-cone
Jan, 199818 pages
Published in:
- Phys.Rev.D 59 (1999) 045013
e-Print:
- hep-ph/9801220 [hep-ph]
Report number:
- ITP-SB-98-05
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Abstract:
Manifestly Lorentz covariant Feynman rules are given in terms of a "scalar" field for each helicity, dramatically simplifying the calculation of amplitudes with massless particles. The spinor helicity formalism is properly identified as a null complex spacelike (not lightlike) gauge, where two massless external momenta define the reference frame. Usually this gauge is applied only to external line factors; we extend this method to vertices and propagators by modifying the action itself using lightcone methods.- Feynman graph
- spinor
- helicity: amplitude analysis
- gauge field theory: Yang-Mills
- light cone
- twistor
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