Relaxed fine-tuning in models with non-universal gaugino masses

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dc.creatorAbe, Hiroyuki
dc.creatorKobayashi, Tatsuo
dc.creatorOmura, Yuji
dc.date2007-03-05
dc.date.accessioned2026-07-07T11:22:44Z
dc.date.available2026-07-07T11:22:44Z
dc.descriptionWe study, in a bottom-up approach, the fine-tuning problem between soft SUSY breaking parameters and the $μ$-term for the successful electroweak symmetry breaking in the minimal supersymmetric standard model. It is shown that certain nontrivial ratios between gaugino masses, that is non-universal gaugino masses, are necessary at the GUT scale, in order for the fine-tuning to be reduced above 10 % order. In addition, when all the gaugino masses should be regarded as independent ones in their origins, a small gluino mass $M_3 \lesssim 120$ GeV and a non-vanishing $A$-term $A_t \sim O(M_3)$ associated to top squarks are also required at the GUT scale as well as the non-universality. On the other hand, when we consider some UV theory, which fixes ratios of soft SUSY breaking parameters as certain values with the overall magnitude, heavier spectra are allowed. It is favored that the gluino and wino masses are almost degenerate at the weak scale, while wider region of bino mass is favorable.
dc.description17 pages, 29 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0703044
dc.identifierhttp://arxiv.org/abs/hep-ph/0703044
dc.identifierPhys.Rev.D76:015002,2007
dc.identifierdoi:10.1103/PhysRevD.76.015002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194669
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleRelaxed fine-tuning in models with non-universal gaugino masses
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