Monophoton signals in light gravitino production at $e^{+}{e}^{-}$ colliders

Abstract

We revisit the monophoton plus missing energy signature at $e^{+}{e}^{-}$ colliders in supersymmetric (SUSY) models where the gravitino is very light. There are two possible processes which provide the signal: gravitino pair production and associated gravitino production with a neutralino, leading the monophoton final state via an additional photon radiation and via the neutralino decay, respectively. By using the superspace formalism, we construct a model that allows us to study the parameter space for the both processes. We show that the signal cross section and the photon spectra provide information on the masses of the SUSY particles as well as the SUSY breaking scale.

11 pages, 7 figures, 3 tables; v2: some issues clarified, fig.3, eq.24 and references added, version accepted by EPJC

References in corpus (5)

• FeynRules - Feynman rules made easy
• Simulating spin-3/2 particles at colliders
• HELAS and MadGraph with goldstinos
• HELAS and MadGraph with spin-3/2 particles
• Multiphoton signatures of goldstini at the LHC

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• Is the Machine Smarter than the Theorist: Deriving Formulas for Particle Kinematics with Symbolic Regression
• Probing some photon portals to new physics at intensity frontier experiments
• Helicity Amplitudes for massive gravitinos in N=1 Supergravity