A Test for Light Gravitino Scenario at the LHC

TL;DR

This paper proposes a simple collider test at the LHC to verify if the gravitino is ultralight, addressing cosmological issues in supersymmetric models with a lightest SUSY particle.

Contribution

It introduces a novel experimental test to determine the lightness of the gravitino in supersymmetric models at the LHC.

Findings

The proposed test can distinguish ultralight gravitino scenarios.

It provides a method to verify the neutralino decay into photon and gravitino.

The approach helps address cosmological gravitino problems.

Abstract

Supersymmetric (SUSY) standard models in which the lightest SUSY particle (LSP) is an ultralight gravitino (m_{3/2}=O(1) eV) are very attractive, since they are free from the cosmological gravitino problems. If the neutralino is the next lightest SUSY particle (NLSP), it decays into a photon and the gravitino in collider experiments. We propose a simple test for the lightness of gravitino at the LHC.