HELAS and MadGraph with goldstinos

Details HELAS and MadGraph with goldstinos HELAS and MadGraph with goldstinos

2011-01-06

arxiv.org/abs/1101.1289v2

Eur.Phys.J.C71:1640,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 6 figures; a footnote and a reference added, version to appear in EPJC

Scientific paper

10.1140/epjc/s10052-011-1640-3

Fortran subroutines to calculate helicity amplitudes with goldstinos, which appear as the longitudinal modes of massive gravitinos in high energy processes, are added to the HELAS (HELicity Amplitude Subroutines) library. They are coded in such a way that arbitrary amplitudes with external goldstinos can be generated automatically by MadGraph, after slight modifications. All the codes have been tested carefully by making use of the goldstino equivalence theorem and the gauge invariance of the helicity amplitudes. Hadronic total cross sections for associated gravitino productions with a gluino and a squark are also presented.

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