Light Scalar Top Quarks and Supersymmetric Dark Matter

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dc.creatorBoehm, C.
dc.creatorDjouadi, A.
dc.creatorDrees, M.
dc.date1999-11-26
dc.date1999-12-07
dc.date.accessioned2026-07-07T10:33:59Z
dc.date.available2026-07-07T10:33:59Z
dc.descriptionA stable neutralino $χ_1^0$, assumed to be the lightest supersymmetric particle, is a favored particle physics candidate for the cosmological Dark Matter. We study co-annihilation of the lightest neutralino with the lighter scalar top quark $\tilde{t}_1$. We show that for natural values of the neutralino mass, $\lsim 300$ GeV, the $χ_1^0 - \tilde{t}_1$ mass difference has to exceed $\sim 10$ to 30 GeV if $χ_1^0$, is to contribute significantly to the Dark Matter. Scenarios with smaller mass splitting, where $\tilde{t}_1$ is quite difficult to detect at collider experiments, are thus cosmologically disfavored. On the other hand, for small $\tilde{t}_1 - χ_1^0$ mass splitting, we show that co--annihilation allows very large neutralino masses, $m_{χ_1^0} \sim 5$ TeV, without ``overclosing'' the Universe.
dc.descriptionLatex, 8 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/9911496
dc.identifierhttp://arxiv.org/abs/hep-ph/9911496
dc.identifierPhys.Rev.D62:035012,2000
dc.identifierdoi:10.1103/PhysRevD.62.035012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179320
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLight Scalar Top Quarks and Supersymmetric Dark Matter
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