Top-bottom mass hierarchy, $s-μ$ puzzle and gauge coupling unification with split multiplets

Details Top-bottom mass hierarchy, $s-μ$ puzzle and gauge coupling unification with split multiplets Top-bottom mass hierarchy, $s-μ$ puzzle and gauge coupling unification with split multiplets

2001-12-06

arxiv.org/abs/hep-ph/0112094v4

Eur.Phys.J. C24 (2002) 159-164

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX file of 17 pages including 3 eps figures. A note is added and typo errors corrected. To appear in Euro. Phys. J. C

Scientific paper

10.1007/s100520200910

A supersymmetric 5D SU(5) grand unification is considered. The SU(5) is broken down to $G_{SM}=SU(3)\times SU(2)\times U(1)$ by the $Z_2\times Z_2'$ assignment of the bulk field(s). The matter fields are located at the fixed point(s). In the bulk, a Higgs multiplet $\bar 5_H$(containing the bottom doublet $H_1$) and the SU(5) gauge multiplet are located. At one fixed point, $H_2$(the top doublet) and the standard model matter multiplets are presented. Because of the difference of the locations of $H_1$ and $H_2$, one can obtain a hierarchy between top and bottom Yukawa couplings. We also present a possibility to understand the $s-\mu$ mass puzzle in this framework of the split multiplet.

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