Cosmological limits on massive LSP's

Keith A. Olive, Mark Srednicki

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

The minimal supersymmetric standard model (MSSM) predicts the existence of a massive stable particle (the lightest supersymmetric particle, or LSP) which could make up the dark matter in the universe. The LSP is commonly considered to be either a photino or a certain linear combination of higgsinos. However, when the supersymmetry-breaking gaugino and higgsino masses are taken to be large (but ≲ 10 TeV), the LSP is typically either a bino (superpartner of the hypercharge gauge boson) or a different linear combination of higgsinos. We calculate in detail the annihilation cross section for these massive (m ≳ 20 GeV)LSP's, and use the results to determine their relic abundance. We show that if the LSP is a bino, both it and at least one squark or slepton must have mass less than ∼ 350 GeV in order to avoid overclosing the universe. If the LSP is a higgsino, its mass must be less than ∼ 1 TeV in order to avoid overclosing the universe. We also study in detail the prospect that the dark matter is composed of one of these particles.

Original languageEnglish (US)
Pages (from-to)208-230
Number of pages23
JournalNuclear Physics, Section B
Volume355
Issue number1
DOIs
StatePublished - May 13 1991

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