Hidden gauginos of an unbroken U(1): Cosmological constraints and phenomenological prospects

Abstract

We study supersymmetric scenarios where the dark matter is the gaugino of an unbroken hidden U(1) which interacts with the visible world only via a small kinetic mixing with the hypercharge. Strong constraints on the parameter space can be derived from avoiding overclosure of the Universe and from requiring successful Big Bang Nucleosynthesis and structure formation. We find that for typical values of the mixing parameter, scenarios with neutralino NLSP are excluded, while scenarios with slepton NLSP are allowed when the mixing parameter lies in the range chi~O(10^(-13) - 10^(-10)). We also show that if the gravitino is the LSP and the hidden U(1) gaugino the NLSP, the bounds on the reheating temperature from long lived charged MSSM relics can be considerably relaxed and we comment on the signatures of these scenarios at future colliders. Finally, we discuss the case of an anomalously small mixing, chi<<10^(-16), where the neutralino becomes a decaying dark matter candidate, and derive constraints from gamma ray experiments.

32 pages, 6 figures

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• Turning off the Lights: How Dark is Dark Matter?
• PAMELA Positron Excess as a Signal from the Hidden Sector
• Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays
• Spectroscopy as a test of Coulomb's law - A probe of the hidden sector
• Dark matter and sub-GeV hidden U(1) in GMSB models
• Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
• Galactic Signatures of Decaying Dark Matter
• From Axions to Other WISPs
• Dark Matter Decay and Cosmic Rays