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 (7)

• Particle physics catalysis of thermal Big Bang Nucleosynthesis
• Bound-State Effects on Light-Element Abundances in Gravitino Dark Matter Scenarios
• Big Bang Nucleosynthesis with Long Lived Charged Massive Particles
• The Relic Abundance of Long-lived Heavy Colored Particles
• Big Bang Nucleosynthesis with Bound States of Long-lived Charged Particles
• Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP
• Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC

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• Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter
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• Prospects for discovering supersymmetric long-lived particles with MoEDAL
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