spinney: A Form library for helicity spinors

Abstract In this work, the library spinney is presented, which provides an implementation of helicity spinors and related algorithms for the symbolical manipulation program Form. The package is well suited for symbolic amplitude calculations both in traditional, Feynman diagram based approaches and unitarity-based techniques. Title of program: spinney Catalogue Id: AEJQ_v1_0 Nature of problem Implementation of the spinor-helicity formalism Versions of this program held in the CPC repository in Mendeley Data AEJQ_v1_0; spinney; 10.1016/j.cpc.2011.06.007 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)