arXiv:0805.2554·v1·High Energy Physics — Phenomenology
HELAS and MadGraph/MadEvent with spin-2 particles
Kaoru Hagiwara🇯🇵 · Junichi Kanzaki🇯🇵 · Qiang Li🇩🇪 · Kentarou Mawatari🇰🇷
Abstract
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.
Comments: 11 pages, 2 figures