On the feasibility of a stop NLSP in gravitino dark matter scenarios

J. Lorenzo Diaz-Cruz, John Ellis, Keith A. Olive, Yudi Santoso

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We analyze the possibility that the lighter stop 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 1qq 'sbaryons' and the corresponding 'antisbaryons' annihilate with conventional antibaryons and baryons into 1 '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.

Original languageEnglish (US)
Article number003
JournalJournal of High Energy Physics
Issue number5
StatePublished - May 1 2007


  • Cosmology of theories beyond the SM
  • Supersymmetric standard model
  • Supersymmetry phenomenology


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