COSMOLOGICAL LIMITS ON MASSIVE LSPS

被引：85

作者：

OLIVE, KA ^{[1
]}

SREDNICKI, M ^{[1
]}

机构：

[1] UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106

来源：

NUCLEAR PHYSICS B | 1991年 / 355卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0550-3213(91)90310-T

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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 less-than-or-similar-to 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 greater-than-or-similar-to 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 approximately 350 GeV in order to avoid overclosing the universe. If the LSP is a higgsino, its mass must be less than approximately 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.

引用

页码：208 / 230

页数：23

共 31 条

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