Confronting Electroweak Fine-tuning with No-Scale Supergravity

الأصل · EN

Applying No-Scale Supergravity boundary conditions at a heavy unification scale to the Flipped SU(5) grand unified theory with extra TeV-scale vector-like multiplets, i.e. No-Scale F-SU(5), we express the Z-boson mass MZ as an explicit function of the boundary gaugino mass M₁/₂, MZ² = MZ² (M₁/₂²), with implicit dependence upon a dimensionless ratio c of the supersymmetric Higgs mixing parameter μ and M₁/₂. Setting the top Yukawa coupling consistent with mₜ = 174.3 GeV at MZ = 91.2 GeV, the value of c naturally tends toward c ≃ 1, which indirectly suggests underlying action of the Giudice-Masiero mechanism. Proportional dependence of all model scales upon the unified gaugino mass M₁/₂ in the No-Scale F-SU(5) model suggests one possible mechanism of confronting the electroweak fine tuning problem.