SpinorsExtras - Mathematica implementation of massive spinor-helicity formalism

TL;DR

SpinorsExtras is a Mathematica package that facilitates symbolic calculations of helicity amplitudes involving massive particles using the spinor-helicity formalism, enhancing computational tools for high-energy physics.

Contribution

It introduces a new Mathematica package that implements the massive spinor-helicity formalism, including objects and relations for symbolic amplitude calculations.

Findings

Enables symbolic manipulation of massive spinors and related vectors.

Supports recursive techniques and Feynman diagrams for amplitude calculations.

Provides tools for real or complex momenta, on- or off-shell computations.

Abstract

We present SpinorsExtras package implementing massive spinor-helicity formalism in Mathematica on top of S@M package. Package defines new objects for Mathematica - massive spinors and reference, associated and polarization vectors. Various properties of introduced symbols and relations among them are implemented together with functions to manipulate and interchange such objects. The package can be used for symbolic calculation of helicity amplitudes involving massive particles with real or complex momenta, using on- or off-shell recursive techniques or Feynman diagrams.