HELAS and MadGraph/MadEvent with spin-2 particles
Kaoru Hagiwara, Junichi Kanzaki, Qiang Li, Kentarou Mawatari
TL;DR
This paper introduces Fortran subroutines for calculating helicity amplitudes involving massive spin-2 particles, integrating them into HELAS and enabling automatic generation of scattering amplitudes with MadGraph and MadEvent.
Contribution
It provides new computational tools for simulating processes with massive gravitons, extending existing software to include spin-2 particles.
Findings
Codes tested for gauge invariance and coordinate transformation invariance.
Enables automatic generation of amplitudes with spin-2 particles.
Facilitates studies of gravitons in collider physics.
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.
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