Light Gravitinos at Colliders and Implications for Cosmology

Details Light Gravitinos at Colliders and Implications for Cosmology Light Gravitinos at Colliders and Implications for Cosmology

2010-04-23

arxiv.org/abs/1004.4213v1

Phys.Rev.D82:015012,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 6 figures. To be submitted to Phys. Rev. D.

Scientific paper

10.1103/PhysRevD.82.015012

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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