On the Feasibility of a Stop NLSP in Gravitino Dark Matter Scenarios

Abstract

We analyze the possibility that the lighter stop {\tilde t_1} could be the next-to-lightest supersymmetric particle (NLSP) in models where the gravitino is the lightest supersymmetric particle (LSP). We do not find any possibility for a stop NLSP in the constrained MSSM with universal input soft supersymmetry-breaking masses at the GUT scale (CMSSM), but do find small allowed regions in models with non-universal Higgs masses (NUHM). We discuss the cosmological evolution of stop hadrons. Most {\tilde t_1}qq `sbaryons' and the corresponding `antisbaryons' annihilate with conventional antibaryons and baryons into {\tilde t_1}{\bar q} `mesinos' and the corresponding `antimesinos', respectively, shortly after the quark-hadron transition in the early Universe, and most mesinos and antimesinos subsequently annihilate. As a result, insufficient metastable charged stop hadrons survive to alter Big Bang nucleosynthesis.

31 pages, 14 figures

References in corpus (3)

• Bound-State Effects on Light-Element Abundances in Gravitino Dark Matter Scenarios
• The Relic Abundance of Long-lived Heavy Colored Particles
• Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP

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• Big-Bang Nucleosynthesis and Gravitino
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• Gamma Ray Spectrum from Gravitino Dark Matter Decay
• Dark Matter Candidates - Axions, Neutralinos, Gravitinos, and Axinos
• Antimatter Signatures of Gravitino Dark Matter Decay
• The number density of a charged relic
• Collider signatures of gravitino dark matter with a sneutrino NLSP
• Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter
• Phenomenology of GUT-less Supersymmetry Breaking
• Resonant scattering and recombination of pseudo-degenerate WIMPs
• Radiative corrections to stoponium annihilation decays
• Interactions of Heavy Hadrons using Regge Phenomenology and the Quark Gluon String Model
• CP Violation in the SUSY Seesaw: Leptogenesis and Low Energy
• Right sneutrinos and the signals of a stable stop at the Large Hadron Collider
• CBBN in the CMSSM
• Holographic Dark Matter and Higgs
• The long-lived stau as a thermal relic
• Beyond the Standard Model at the LHC and Beyond
• Prospects for Discovering Supersymmetry at the LHC
• Gravitino Dark Matter with Stop as the NLSP