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Manifestly Lorentz covariant Feynman rules are given in terms of a "scalar"field for each helicity, dramatically simplifying the calculation of amplitudeswith massless particles. The spinor helicity formalism is properly identifiedas a null complex spacelike (not lightlike) gauge, where two massless externalmomenta define the reference frame. Usually this gauge is applied only toexternal line factors; we extend this method to vertices and propagators bymodifying the action itself using lightcone methods.Comment: 18 pages, late

Simplifying algebra in Feynman graphs. II. Spinor helicity from the spacecone