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A New Method for Helicity Calculations

A. Ballestrero, E. Maina

Abstract

We propose a new helicity formalism based on the formal insertion in spinor lines of a complete set of states build up with unphysical spinors. The method is developed both for massless and massive fermions for which it turns out to be particularly fast. All relevant formulae are given.

A New Method for Helicity Calculations

Abstract

We propose a new helicity formalism based on the formal insertion in spinor lines of a complete set of states build up with unphysical spinors. The method is developed both for massless and massive fermions for which it turns out to be particularly fast. All relevant formulae are given.

Paper Structure

This paper contains 9 sections, 58 equations.

Table of Contents

  1. Introduction
  2. Spinors
  3. Outline of the method. $T$ functions
  4. Spinor lines
  5. $\tau$ matrices
  6. Massless spinor lines
  7. Combining spinor lines. A simple example
  8. Comments and conclusions
  9. Appendix A