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.
|Number of pages||8|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Issue number||7 B|
|Publication status||Published - 2002 Apr 1|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)