HELAS and MadGraph with spin-3/2 particles

被引：0
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作者：
K. Hagiwara
K. Mawatari
Y. Takaesu
机构：
[1] KEK Theory Center,Theoretische Natuurkunde and IIHE/ELEM
[2] and Sokendai,Institut für Theoretische Physik
[3] Vrije Universiteit Brussel,undefined
[4] and International Solvay Institutes,undefined
[5] Universität Heidelberg,undefined
来源：
The European Physical Journal C | 2011年 / 71卷
关键词：
Vector Boson; SUSY Breaking; Light Supersymmetric Particle; Helicity Amplitude; Scalar Boson;
D O I：
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中图分类号：
学科分类号：
摘要：
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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