Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-02
Phys.Rev. D65 (2002) 075013
Physics
High Energy Physics
High Energy Physics - Phenomenology
21pages, 6figures
Scientific paper
10.1103/PhysRevD.65.075013
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 to s gamma) and muon g-2. The bottom-tau unification can be accommodated to the measured branching ratio Br(b to s gamma) if superparticle masses are relatively heavy and higgsino mass parameter \mu 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 SUSY scale upset the Yukawa unification with more than 20 percent 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.
Komine Shinji
Yamaguchi Masahiro
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