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.
Highlights
Monophoton events with missing energy (γ + E/ ) are one of the promising search channels to find new physics at both lepton and hadron colliders
The first term gives the kinetic term of the (s)goldstino, while the second term is a source of SUSY breaking and F ≡ FX is a vacuum expectation value (VEV) of FX
Based on the model we constructed in the previous section, we investigate direct lightest SUSY particle (LSP) gravitino production processes that lead to γ + E/ at future e+e− colliders
Summary
Monophoton events with missing energy (γ + E/ ) are one of the promising search channels to find new physics at both lepton and hadron colliders. The monophoton signal in the context of SUSY models has been searched for models where the gravitino is the lightest SUSY particle (LSP) with the very light mass m3/2 ∼ O(10−14–10−12 GeV) at the LEP [1,2,3,4] and the Tevatron [5].1. In such scenarios there are two possible processes providing the signal: gravitino pair production (G G ) and neutralino–gravitino associated production (χ G ). In Appendix B, to validate our model implementation of sgoldstinos, we briefly discuss the γ γ → G Gprocess
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