Associated production of light gravitinos in e^+e^- and e^-γcollisions

Abstract

Light gravitino productions in association with a neutralino (selectron) in e^+e^- (e^-γ) collisions are restudied in a scenario that the lightest supersymmetric particle is a gravitino and the produced neutralino (selectron) promptly decays into a photon (electron) and a gravitino. We explicitly give the helicity amplitudes for the production processes by using the effective goldstino interaction Lagrangian, and present the cross sections with different collision energies and mass spectra. We also examine selection efficiencies by kinematical cuts and beam polarizations for the signal and background processes, and show that the energy and angular distributions of the photon (electron) can explore the mass of the t-channel exchange particle as well as the mass of the decaying particle at a future e^+e^- (e^-γ) collider.

12 pages, 12 figures, 4 tables; references added, version to appear in EPJC

References in corpus (6)

• MadGraph/MadEvent v4: The New Web Generation
• ILC Reference Design Report Volume 1 - Executive Summary
• Spin Analysis of Supersymmetric Particles
• New Results for Light Gravitinos at Hadron Colliders - Tevatron Limits and LHC Perspectives
• HELAS and MadGraph with goldstinos
• HELAS and MadGraph with spin-3/2 particles

Cited by in corpus (8)

• Simulating spin-3/2 particles at colliders
• Low Scale Supersymmetry Breaking and its LHC Signatures
• Higgs decay with monophoton + MET signature from low scale supersymmetry breaking
• Signals of a superlight gravitino at the LHC
• Light gravitino production in association with gluinos at the LHC
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Collider signatures of goldstini in gauge mediation
• Monophoton signals in light gravitino production at $e^{+}{e}^{-}$ colliders