HELAS and MadGraph with spin-3/2 particles

Details HELAS and MadGraph with spin-3/2 particles HELAS and MadGraph with spin-3/2 particles

2010-10-20

arxiv.org/abs/1010.4255v2

Eur.Phys.J.C71:1529,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures; sections rearranged, typos corrected, version to appear in EPJC

Scientific paper

10.1140/epjc/s10052-010-1529-6

Fortran subroutines to calculate helicity amplitudes with massive spin-3/2 particles, such as massive gravitinos, which couple to the standard model and supersymmetric particles via the supercurrent, are added to the HELAS (HELicity Amplitude Subroutines) library. They are coded in such a way that arbitrary amplitudes with external gravitinos can be generated automatically by MadGraph, after slight modifications. All the codes have been tested carefully by making use of the gauge invariance of the helicity amplitudes.

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