Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-02-04
Phys.Rev. D66 (2002) 095011
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, latex, 4 figures
Scientific paper
10.1103/PhysRevD.66.095011
We discuss issues in a scenario that hierarchical Yukawa couplings are generated through strong dynamics of superconformal field theories (SCFTs). Independently of mediation mechanism of supersymmetry breaking, infrared convergence property of SCFTs can provide an interesting solution to supersymmetric flavor problem; sfermion masses are suppressed around the decoupling scale of SCFTs and eventually become degenerate to some degree, thanks to family-independent radiative corrections governed by the SM gaugino masses. We discuss under what conditions the degeneracy of sfermion mass can be estimated in a simple manner. We also discuss the constraints from lepton flavor violations. We then study explicitly sfermion mass degeneracy within the framework of grand unified theories coupled to SCFTs. It is found that the degeneracy for right-handed sleptons becomes worse in the conventional SU(5) model than in the MSSM. On the other hand, in the flipped SU(5) \times U(1) model, each right-handed lepton is still an SU(5)-singlet, whereas the bino mass M_1 is determined by two independent gaugino masses of SU(5) \times U(1). These two properties enable us to have an improved degeneracy for the right-handed sleptons. We also speculate how further improvement can be obtained in the SCFT approach.
Kobayashi Tatsuo
Nakano Hiroaki
Noguchi Tatsuya
Terao Haruhiko
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