Work

HELAS and MadGraph with spin-3/2 particles

Year: 2011

Type: article

Abstract: Fortran subroutines to calculate helicity amplitudes with massive spin-3/2 particles, such as massive gravitinos, which couple to the standard model and supersymmetric particles via the supercurrent, are added to the HELAS ( HEL icity A mplitude S ubroutines) library. They are coded in such a way that arbitrary amplitudes with external gravitinos can be generated automatically by MadGraph , after slight modifications. All the codes have been tested carefully by making use of the gauge invariance of the helicity amplitudes.

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-010-1529-6

Authors: K. Hagiwara, K. Mawatari, Y. Takaesu

Institutions: High Energy Accelerator Research Organization, Vrije Universiteit Brussel, Heidelberg University, International Solvay Institutes

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid:

Funders: Belgian Federal Science Policy Office, Japan Society for the Promotion of Science