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Light-gravitino production at hadron colliders

1998; American Physical Society; Volume: 57; Issue: 1 Linguagem: Inglês

10.1103/physrevd.57.373

1538-4500

Jaewan Kim, Jorge L. Lopez, D.V. Nanopoulos, Raghavan Rangarajan, A. Zichichi,

Cosmology and Gravitation Theories

We consider the production of gravitinos $(\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{G})$ in association with gluinos $(\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g})$ or squarks $(\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{q})$ at hadron colliders, including the three main subprocesses: $q\overline{q}\ensuremath{\rightarrow}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{G},$ and $q\stackrel{\ensuremath{\rightarrow}}{g}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{q}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{G},$ and $g\stackrel{\ensuremath{\rightarrow}}{g}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{G}.$ These channels become enhanced to the point of being observable for sufficiently light gravitino masses ${(m}_{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{G}}<{10}^{\ensuremath{-}4}\mathrm{eV}),$ as motivated by some supersymmetric explanations of the Collider Detector at Fermilab $\mathrm{ee}\ensuremath{\gamma}\ensuremath{\gamma}{+E}_{T,\mathrm{miss}}$ event. The characteristic signal of such events would be monojets, as opposed to dijets obtained in the more traditional supersymmetric process $p\overline{p}\ensuremath{\rightarrow}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}.$ 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.