Eur. Phys. J. C (2014) 74: 2909
https://doi.org/10.1140/epjc/s10052-014-2909-0

Regular Article - Theoretical Physics

Monophoton signals in light gravitino production at colliders

¹ Theoretische Natuurkunde and IIHE/ELEM, Vrije Universiteit Brussel, Brussels, Belgium
² International Solvay Institutes, Pleinlaan 2, 1050 , Brussels, Belgium

^* e-mail: kentarou.mawatari@vub.ac.be

Received: 21 February 2014
Accepted: 15 May 2014
Published online: 11 June 2014

Abstract

We revisit the monophoton plus missing energy signature at 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.