Light-gravitino production at hadron colliders

We consider the production of gravitinos ( ̃ \~G) in association with gluinos ( ̃ \~g) or squarks ( ̃ \~q) at hadron colliders, including the three main subprocesses: qq̄→ ̃ \~g ̃ \~G, and q→g ̃ \~q ̃ \~G, and g→g ̃ \~g ̃ \~G. These channels become enhanced to the point of being observable for sufficiently light gravitino masses (m_ ̃ \~G<10^-4eV), as motivated by some supersymmetric explanations of the Collider Detector at Fermilab eeγγ+ET,miss event. The characteristic signal of such events would be monojets, as opposed to dijets obtained in the more traditional supersymmetric process pp̄→ ̃ \~g ̃ \~g. Searches for such events at the Fermilab Tevatron can impose lower limits on the gravitino mass. In the appendixes, we provide a complete set of Feynman rules for the gravitino interactions used in our calculation.