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arXiv · 1004.4213

Light Gravitinos at Colliders and Implications for Cosmology

Jonathan L. Feng·Marc Kamionkowski·Samuel K. Lee
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Abstract

Light gravitinos, with mass in the eV to MeV range, are well-motivated in particle physics, but their status as dark-matter candidates is muddled by early-Universe uncertainties. We investigate how upcoming data from colliders may clarify this picture. Light gravitinos are produced primarily in the decays of the next-to-lightest supersymmetric particle, resulting in spectacular signals, including di-photons, delayed and non-pointing photons, kinked charged tracks, and heavy metastable charged particles. We find that the Tevatron with 20/fb and the 7 TeV LHC with 1/fb may both see evidence for hundreds of light-gravitino events. Remarkably, this collider data is also well suited to distinguish between currently viable light-gravitino scenarios, with striking implications for structure formation, inflation, and other early-Universe cosmology.

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Jonathan L. Feng, Marc Kamionkowski, Samuel K. Lee. 2010-04-23. Light Gravitinos at Colliders and Implications for Cosmology. https://doi.org/10.1103/physrevd.82.015012

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