Signatures of Axinos and Gravitinos at Colliders

Abstract

The axino and the gravitino are well-motivated candidates for the lightest supersymmetric particle (LSP) and also for cold dark matter in the Universe. Assuming that a charged slepton is the next-to-lightest supersymmetric particle (NLSP), we show how the NLSP decays can be used to probe the axino LSP scenario in hadronic axion models as well as the gravitino LSP scenario at the Large Hadron Collider and the International Linear Collider. We show how one can identify experimentally the scenario realized in nature. In the case of the axino LSP, the NLSP decays will allow one to estimate the value of the axino mass and the Peccei-Quinn scale.

arXiv comment20 pages, 5 figures, revised version as published in Phys.Lett.B (comments on the experimental feasibility added)

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• Goldstini
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• Collider signatures of gravitino dark matter with a sneutrino NLSP
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• Determining Reheating Temperature at Colliders with Axino or Gravitino Dark Matter
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• Axino warm dark matter and ${\Omega }_b-{\Omega }_{DM}$ coincidence
• The Cosmological Axino Problem
• A note on the primordial abundance of stau NLSPs
• The Gravitino in Gaugino Mediation
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• Dark Matter at the Fermi Scale
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• The long-lived stau as a thermal relic
• The supersymmetric flavour problem in 5D GUTs and its consequences for LHC phenomenology
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• Common Origin of Warm Dark Matter and Dark Radiation
• RH Sneutrino Condensate CDM and the Baryon-to-Dark Matter Ratio
• Exploring the Hadronic Axion Window via Delayed Neutralino Decay to Axinos at the LHC
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