HELAS and MadGraph with goldstinos

HELAS and MadGraph with goldstinos

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 goldstino...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2011-06, Vol.71 (6), p.1-10, Article 1640
Hauptverfasser: Mawatari, K., Takaesu, Y.
Format: Artikel
Sprache:eng
Schlagworte:
Amplitudes
Astronomy
Astrophysics and Cosmology
Cross sections
Elementary Particles
Exact sciences and technology
FORTRAN
Gauge invariance
Gravitinos
Hadrons
Heavy Ions
Helicity
Longitude
Mathematical analysis
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Special Article - Tools for Experiment and Theory
String Theory
Subroutines
The physics of elementary particles and fields
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Zusammenfassung: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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-011-1640-3