Associated production of light gravitinos in e^+e^- and e^-γ collisions

Details Associated production of light gravitinos in e^+e^- and e^-γ collisions Associated production of light gravitinos in e^+e^- and e^-γ collisions

2011-06-28

arxiv.org/abs/1106.5592v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

Light gravitino productions in association with a neutralino (selectron) in e^+e^- (e^-\gamma) 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^-\gamma) collider.

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