Neutralino-Stau Coannihilation and the Cosmological Upper Limit on the Mass of the Lightest Supersymmetric Particle

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dc.creatorEllis, John
dc.creatorFalk, Toby
dc.creatorOlive, Keith A.
dc.date1998-10-14
dc.date1998-10-15
dc.date.accessioned2026-07-07T10:33:45Z
dc.date.available2026-07-07T10:33:45Z
dc.descriptionWe consider the effects of neutralino-stau coannihilations on the cosmological relic density of the lightest supersymmetric particle (LSP) $χ$ in the 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, $χ$ is approximately a U(1) gaugino ${\tilde B}$, and constraints on the cosmological relic density $Ω_{\tilde B} h^2$ yield an upper bound on the bino mass. We show that in regions of parameter space for which the cosmological bound is nearly saturated, coannihilations of the $\tilde B$ with the stau, the next lightest sparticle, are important and may reduce significantly the bino relic density. Including also bino coannihilations with the selectrons and smuons, 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.
dc.description10 pages in LaTeX, including 2 encapsulated postscript figures; uses epsf.sty; typo corrected
dc.identifierhttps://arxiv.org/abs/hep-ph/9810360
dc.identifierhttp://arxiv.org/abs/hep-ph/9810360
dc.identifierPhys.Lett.B444:367-372,1998
dc.identifierdoi:10.1016/S0370-2693(98)01392-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179228
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleNeutralino-Stau Coannihilation and the Cosmological Upper Limit on the Mass of the Lightest Supersymmetric Particle
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