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We consider the Z'/Z mass hierarchy in a supersymmetric model in which theU(1)' is broken in a secluded sector coupled to the ordinary sector only bygauge and possibly soft terms. A large mass hierarchy can be achieved whilemaintaining the normal sparticle spectra if there is a direction in which thetree level potential becomes flat when a particular Yukawa coupling vanishes.We describe the conditions needed for the desired breaking pattern, to avoidunwanted global symmetries, and for an acceptable effective mu parameter. Theelectroweak breaking is dominated by A terms rather than scalar masses, leadingto tan beta ~ 1. The spectrum of the symmetry breaking sector is displayed.There is significant mixing between the MSSM particles and new standard modelsinglets, for both the Higgs scalars and the neutralinos. A larger Yukawacoupling for the effective mu parameter is allowed than in the NMSSM because ofthe U(1)' contribution to the running from a high scale. The upper bound on thetree-level mass of the lightest CP even Higgs doublet mass is about c x 174GeV, where c is of order unity, but the actual mass eigenvalues are generallysmaller because of singlet mixing.Comment: Latex, 12 Tables, 22 page

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Z</mml:mi><mml:mo>−</mml:mo><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>mass hierarchy in a supersymmetric model with a secluded<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>U</mml:mi><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:mrow><mml:…

Z−Z′mass hierarchy in a supersymmetric model with a secludedU(1)