Relaxed fine-tuning in models with nonuniversal gaugino masses

Hiroyuki Abe, Tatsuo Kobayashi, Yuji Omura

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

We study, in a bottom-up approach, the fine-tuning problem between soft supersymmetry (SUSY) breaking parameters and the μ term for the successful electroweak symmetry breaking in the minimal supersymmetric standard model. It is shown that certain ratios among nonuniversal gaugino masses at the grand unified theory (GUT) scale are necessary to reduce fine-tuning. In addition, when all the gaugino masses are regarded as independent ones in their origins, a small gluino mass M3 120GeV and a nonvanishing A term At∼O(M3) associated with top squarks are also required at the GUT scale as well as the nonuniversality. On the other hand, when we consider some UV theory, which fixes ratios of soft SUSY breaking parameters as certain values aside from the overall magnitude, heavier spectra are allowed. It is favored that the gluino and W-ino masses are almost degenerate at the weak scale, while a wider region of b-ino mass is favorable.

Original languageEnglish
Article number015002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume76
Issue number1
DOIs
Publication statusPublished - 2007 Jul 9
Externally publishedYes

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Tuning
tuning
grand unified theory
Supersymmetry
supersymmetry
Model
Term
Bottom-up
Symmetry Breaking
fixing
Standard Model
broken symmetry
Necessary

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Relaxed fine-tuning in models with nonuniversal gaugino masses. / Abe, Hiroyuki; Kobayashi, Tatsuo; Omura, Yuji.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 76, No. 1, 015002, 09.07.2007.

Research output: Contribution to journalArticle

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