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 language | English (US) |
|---|---|
| Pages (from-to) | 208-230 |
| Number of pages | 23 |
| Journal | Nuclear Physics, Section B |
| Volume | 355 |
| Issue number | 1 |
| DOIs | |
| State | Published - May 13 1991 |
Bibliographical note
Funding Information:The work of K.A.O. was supported in part by DOE Grant No. DE-AC02-83ER-40105, and by a Presidential Young Investigator Award. The work of M.S. was supported in part by NSF Grant No. PHY-86-14185, and by a Research Fellowship from the Alfred P. Sloan Foundation.