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The Electroweak sector in E6 supersymmetric models is subject to a degree offine tuning in the percent to permil level. This can be attributed to theexperimental limits on both the mass of the Z' boson associated with the extraU(1)' symmetry in the model, as well as the masses of naturalness-relatedsparticles (which is a general source of tuning in supersymmetric models). Thedegree of tuning can be smaller than that in the minimal supersymmetricstandard model with universal fundamental parameters (the constrained MSSM). Weshow this by quantifying the fine tuning in regions of the parameter space ofthe constrained exceptional supersymmetric standard model (cE6SSM)corresponding to values of tan beta below and above 10. It is found that, aHiggs mass m_h ~ 125 GeV, a gluino mass ~ 1.5 TeV, and a Z' boson mass m_Z' ~3.8 TeV correspond to fine tuning in the 0.2% (0.1%) level for tan beta = 30(5).

Fine tuning in small and large tan beta regions in the cE6SSM