HELAS and MadGraph with goldstinos

Abstract

Fortran subroutines to calculate helicity amplitudes with goldstinos, which appear as the longitudinal modes of massive gravitinos in high energy processes, are added to the HELAS (HELicity Amplitude Subroutines) library. They are coded in such a way that arbitrary amplitudes with external goldstinos can be generated automatically by MadGraph, after slight modifications. All the codes have been tested carefully by making use of the goldstino equivalence theorem and the gauge invariance of the helicity amplitudes. Hadronic total cross sections for associated gravitino productions with a gluino and a squark are also presented.

9 pages, 6 figures; a footnote and a reference added, version to appear in EPJC

References in corpus (15)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Theories with Gauge-Mediated Supersymmetry Breaking
• MadGraph/MadEvent v4: The New Web Generation
• MadEvent: Automatic Event Generation with MadGraph
• Automatic Generation of Tree Level Helicity Amplitudes
• Thermal Production of Gravitinos
• Goldstini
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• Weak boson fusion production of supersymmetric particles at the LHC
• New Collider Bound on Light Gravitino Mass
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• HELAS and MadGraph with spin-3/2 particles

Cited by in corpus (16)

• Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• ALOHA: Automatic Libraries Of Helicity Amplitudes for Feynman diagram computations
• Beyond the Minimal Supersymmetric Standard Model: from theory to phenomenology
• Simulating spin-3/2 particles at colliders
• Signals of a superlight gravitino at the LHC
• Comprehensive Constraints on a Spin-3/2 Singlet Particle as a Dark Matter Candidate
• Higgs decay to goldstini and its observability at the LHC
• Collider signatures of goldstini in gauge mediation
• Light gravitino production in association with gluinos at the LHC
• Pseudo-goldstino and electroweakinos via VBF processes at LHC
• Multilepton signals of gauge mediated supersymmetry breaking at the LHC
• Pseudo-goldstino and electroweak gauginos at the LHC
• Associated production of light gravitinos in e^+e^- and e^-γcollisions
• Z-peaked excess in goldstini scenarios
• Multiphoton signatures of goldstini at the LHC
• Monophoton signals in light gravitino production at $e^{+}{e}^{-}$ colliders