Top - bottom mass hierarchy , s − μ puzzle and gauge coupling unification with split multiplets ( a ) Hyung

A supersymmetric 5D SU(5) grand unification is considered. The SU(5) is broken down to GSM = SU(3)× SU(2)×U(1) by the Z2 ×Z ′ 2 assignment of the bulk field(s). The matter fields are located at the fixed point(s). In the bulk, a Higgs multiplet 5̄H(containing the bottom doublet H1) and the SU(5) gauge multiplet are located. At one fixed point, H2(the top doublet) and the standard model matter multiplets are presented. Because of the difference of the locations of H1 and H2, one can obtain a hierarchy between top and bottom Yukawa couplings. We also present a possibility to understand the s− μ mass puzzle in this framework of the split multiplet. [email protected] [email protected] [email protected]