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 HELAS (HELicity Amplitude Subroutines) 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.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License ( https://creativecommons.org/licenses/by-nc/2.0 ), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Hagiwara, K., Kanzaki, J., Li, Q. et al. HELAS and MadGraph/MadEvent with spin-2 particles. Eur. Phys. J. C 56, 435–447 (2008). https://doi.org/10.1140/epjc/s10052-008-0663-x
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DOI: https://doi.org/10.1140/epjc/s10052-008-0663-x