Bottom-tau unification in a supersymmetric SU(5) grand unified theory and constraints from b→sγ and muon g - 2

Shinji Komine, Masahiro Yamaguchi

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

An analysis is made on bottom-tau Yukawa unification in supersymmetric (SUSY) SU(5) grand unified theory (GUT) in the framework of minimal supergravity, in which the parameter space is restricted by some experimental constraints including Br(b→ s γ) and muon g - 2. The bottom-tau unification can be accommodated to the measured branching ratio Br(b→s γ) if superparticle masses are relatively heavy and the Higgsino mass parameter μ is negative. On the other hand, if we take the latest muon g - 2 data to require positive SUSY contributions, then wrong-sign threshold corrections at the SUSY scale upset the Yukawa unification with more than 20% discrepancy. It has to be compensated by superheavy threshold corrections around the GUT scale, which constrains models of flavor in SUSY GUT. A pattern of the superparticle masses preferred by the three requirements is also commented upon.

Original languageEnglish
Article number075013
Pages (from-to)750131-750138
Number of pages8
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume65
Issue number7 B
Publication statusPublished - 2002 Apr 1

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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