HELAS and MadGraph/MadEvent with spin-2 particles

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Fortran subroutines to calculate helicity amplitudes with massive spin-2 particles (massive gravitons), which couple to the standard model particles via the energy momentum tensor, are added to the {\tt HELAS} ({\tt HEL}icity {\tt A}mplitude {\tt S}ubroutines) library. They are coded in such a way that arbitrary scattering amplitudes with one graviton production and its decays can be generated automatically by {\tt MadGraph} and {\tt MadEvent}, after slight modifications. All the codes have been tested carefully by making use of the invariance of the helicity amplitudes under the gauge and general coordinate transformations.
11 pages, 2 figures

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/203703

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0805.2554
 http://arxiv.org/abs/0805.2554
 Eur.Phys.J.C56:435-447,2008
 doi:10.1140/epjc/s10052-008-0663-x

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arXiv