Constraints on neutralino dark matter from LEP 2 and cosmology

被引：123

作者：

Ellis, J ^{[1
]}

Falk, T

Olive, KA

Schmitt, M

机构：

[1] CERN, Div TH, CH-1211 Geneva, Switzerland

[2] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[3] CERN, Div PPE, CH-1211 Geneva, Switzerland

来源：

PHYSICS LETTERS B | 1997年 / 413卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(97)01122-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A significant lower limit on the mass of the lightest neutralino chi can be obtained by combining the results from sparticle searches at LEP at centre-of-mass energies up to 172 GeV with cosmological considerations, if it is assumed that the chi is stable. Exclusion domains from slepton searches close m(chi)similar to 0 loopholes that were left open by previous lower-energy LEP searches for charginos and neutralinos, leading to the lower limit m(chi)greater than or similar to 17 GeV. The constraints on supersymmetric parameter space are strengthened significantly if LEP constraints on supersymmetric Higgs bosons are taken into account, and further if the relic neutralino density is required to fall within the range favoured by astrophysics and cosmology. These bounds are considerably strengthened if universality at the GUT scale is assumed for soft supersymmetry-breaking scalar masses, including those of the Higgs bosons. In this case, the Higgs searches play a dramatic role, and we find that m(chi)greater than or similar to 40 GeV. Furthermore, we find that if tan beta less than or similar to 1.7 for mu < 0, or tan beta less than or similar to 1.4 for mu > 0, the cosmological relic density is too large for all values of m(chi). (C) 1997 Elsevier Science B.V.

引用

页码：355 / 364

页数：10

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