Neutralino-stau coannihilation and the cosmological upper limit on the mass of the lightest supersymmetric particle

John Ellis; Toby Falk; Keith A. Olive

doi:10.1016/S0370-2693(98)01392-6

Neutralino-stau coannihilation and the cosmological upper limit on the mass of the lightest supersymmetric particle

John Ellis
, Toby Falk
, Keith A. Olive

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

390 Scopus citations

Abstract

We consider the effects of neutralino-stau (χ - τ̃) coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) χ̃ minimal supersymmetric extension of the Standard Model (MSSM), particularly in the constrained MSSM in which universal supergravity inputs at the GUT scale are assumed. For much of the parameter space in these models, χ̃ approximately a U(1) gaugino B̃, and constraints on the cosmological relic density Ω_B̃h² yield an upper bound on mB̃. We show that in regions of parameter space for which the cosmological bound is nearly saturated, coannihilations of the B̃ with the τ̃, the next lightest sparticle, are important and may reduce significantly the B̃ relic density. Including also B̃ coannihilations with the ẽ and μ̃, we find that the upper limit on m_χ̃ is increased from about 200 GeV to about 600 GeV in the constrained MSSM, with a similar new upper limit expected in the MSSM.

Original language	English (US)
Pages (from-to)	367-372
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	444
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(98)01392-6
State	Published - Dec 24 1998

Bibliographical note

Funding Information:
The work of K.O. was supported in part by DOE grant DE–FG02–94ER–40823. The work of T.F. was supported in part by DOE grant DE–FG02–95ER–40896 and in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation.

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title = "Neutralino-stau coannihilation and the cosmological upper limit on the mass of the lightest supersymmetric particle",

abstract = "We consider the effects of neutralino-stau (χ - {\~τ}) coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) {\~χ} minimal supersymmetric extension of the Standard Model (MSSM), particularly in the constrained MSSM in which universal supergravity inputs at the GUT scale are assumed. For much of the parameter space in these models, {\~χ} approximately a U(1) gaugino {\~B}, and constraints on the cosmological relic density Ω{\~B}h2 yield an upper bound on m{\~B}. We show that in regions of parameter space for which the cosmological bound is nearly saturated, coannihilations of the {\~B} with the {\~τ}, the next lightest sparticle, are important and may reduce significantly the {\~B} relic density. Including also {\~B} coannihilations with the ẽ and {\~μ}, we find that the upper limit on m{\~χ} is increased from about 200 GeV to about 600 GeV in the constrained MSSM, with a similar new upper limit expected in the MSSM.",

author = "John Ellis and Toby Falk and Olive, \{Keith A.\}",

note = "Funding Information: The work of K.O. was supported in part by DOE grant DE{\textendash}FG02{\textendash}94ER{\textendash}40823. The work of T.F. was supported in part by DOE grant DE{\textendash}FG02{\textendash}95ER{\textendash}40896 and in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation.",

year = "1998",

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AU - Ellis, John

AU - Falk, Toby

AU - Olive, Keith A.

N1 - Funding Information: The work of K.O. was supported in part by DOE grant DE–FG02–94ER–40823. The work of T.F. was supported in part by DOE grant DE–FG02–95ER–40896 and in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation.

PY - 1998/12/24

Y1 - 1998/12/24

N2 - We consider the effects of neutralino-stau (χ - τ̃) coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) χ̃ minimal supersymmetric extension of the Standard Model (MSSM), particularly in the constrained MSSM in which universal supergravity inputs at the GUT scale are assumed. For much of the parameter space in these models, χ̃ approximately a U(1) gaugino B̃, and constraints on the cosmological relic density ΩB̃h2 yield an upper bound on mB̃. We show that in regions of parameter space for which the cosmological bound is nearly saturated, coannihilations of the B̃ with the τ̃, the next lightest sparticle, are important and may reduce significantly the B̃ relic density. Including also B̃ coannihilations with the ẽ and μ̃, we find that the upper limit on mχ̃ is increased from about 200 GeV to about 600 GeV in the constrained MSSM, with a similar new upper limit expected in the MSSM.

AB - We consider the effects of neutralino-stau (χ - τ̃) coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) χ̃ minimal supersymmetric extension of the Standard Model (MSSM), particularly in the constrained MSSM in which universal supergravity inputs at the GUT scale are assumed. For much of the parameter space in these models, χ̃ approximately a U(1) gaugino B̃, and constraints on the cosmological relic density ΩB̃h2 yield an upper bound on mB̃. We show that in regions of parameter space for which the cosmological bound is nearly saturated, coannihilations of the B̃ with the τ̃, the next lightest sparticle, are important and may reduce significantly the B̃ relic density. Including also B̃ coannihilations with the ẽ and μ̃, we find that the upper limit on mχ̃ is increased from about 200 GeV to about 600 GeV in the constrained MSSM, with a similar new upper limit expected in the MSSM.

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Neutralino-stau coannihilation and the cosmological upper limit on the mass of the lightest supersymmetric particle

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