Yukawa unification: The good, the bad, and the ugly
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
- Stanford Univ., Stanford, CA (United States). Dept. of Physics
- Lawrence Berkeley Lab., CA (United States)
We analyze some consequences of grand unification of the third-generation Yukawa couplings, in the context of the minimal supersymmetric standard model. We address two issues: the prediction of the top quark mass, and the generation of the top-bottom mass hierarchy through a hierarchy of Higgs vacuum expectation values. The top mass is strongly dependent on a certain ratio of superpartner masses. And the VEV hierarchy always entails some tuning of the GUT-scale parameters. We study the RG equations and their semi-analytic solutions, which exhibit several interesting features, such as a focusing effect for a large Yukawa coupling in the limit of certain symmetries and a correlation between the A terms (which contribute to b {yields} s{gamma}) and the gaugino masses. This study shows that non-universal soft-SUSY-breaking masses are favored (in particular for splitting the Higgs-doublets via D-terms and for allowing more natural scenarios of symmetry breaking), and hints at features desired in Yukawa-unified models. Several phenomenological implications are also revealed.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 58051
- Report Number(s):
- LBL-36392; CONF-940288-2; ON: DE95011275; CNN: PHY-89-17438; PHY-91-21039; PHY-90-21139; TRN: 95:013168
- Resource Relation:
- Conference: 2. IFT workshop on Yukawa couplings and the origin of mass, Gainesville, FL (United States), 11-13 Feb 1994; Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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