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Open Access item SUSY-GUTs, SUSY-Seesaw and the neutralino dark matter

Authors:Calibbi, Lorenzo
Mambrini, Yann
Vempati, Sudhir Kumar
Keywords:Probe WMAP observations, Relic density, Stau coannihilation, Flavor violation, Supersymmetry phenomenology, MSSM, GUT
Issue Date:19-Sep-2007
Publisher:International School for Advanced Studies
Institute of Physics Publishing
Citation:Journal of High Energy Physics 9: 081 (2007)
Abstract:We will consider a SUSY-SU(5) with one right-handed neutrino with a large top like Yukawa coupling. Assuming universal soft masses at high scale we compute the low-energy spectrum and subsequently the neutralino LSP relic density taking also into consideration SU(5) as well as the see-saw running effects above the gauge coupling unification scale. We found that there exists no viable region in parameter space for tan β less than or similar to 35. The τ[overline] coannihilation process starts becoming efficient for tan β greater than or similar to 35-40. However, this process is significantly constrained by the limited range in which the stau is lighter than the neutralino. Infact, for a given tan β we find that there exists an upper bound on the lightest neutralino mass (M-chi-1(0)) in this region. The A-pole funnel region appears at very large tan β similar or equal to 45-50, while the focus-point region does not make an appearance till large (m(0),M-1/2), namely a few TeV. Large A(0) terms at high scale can lead to extended regions consistent with WMAP constraints and remove the upper bounds in the stau coannihilation regions.
Description:19 pages, 7 figures.-- ISI Article Identifier: 000249788800048.-- ArXiv pre-print available at: http://arxiv.org/abs/0704.3518
Publisher version (URL):http://dx.doi.org/10.1088/1126-6708/2007/09/081
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