2008/05/16 by Kaoru Hagiwara, K. Hagiwara, Junichi Kanzaki +5 · 2 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-008-0663-x
published as Eur.Phys.J.C56:435-447,2008 · 11 pages, 2 figures
arxiv created 2008/05/16 · openalex publication_date 2008/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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 HELAS ( HEL icity A mplitude 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 MadGraph and 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.