HELAS and MadGraph/MadEvent with spin-2 particles
High Energy Physics - Phenomenology
2008-11-26 v1
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.
Keywords
Cite
@article{arxiv.0805.2554,
title = {HELAS and MadGraph/MadEvent with spin-2 particles},
author = {Kaoru Hagiwara and Junichi Kanzaki and Qiang Li and Kentarou Mawatari},
journal= {arXiv preprint arXiv:0805.2554},
year = {2008}
}
Comments
11 pages, 2 figures