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We study the generation of the GUT scale through radiative corrections in thecontext of a R-symmetric "flipped" SU(5) X U(1)_X model. A negative masssquared term for the GUT Higgs fields develops due to radiative effects along aflat direction at a superheavy energy scale. The R-symmetry is essential inmaintaining triplet-doublet splitting and F-flatness in the presence ofnon-renormalizable terms. The model displays radiative electroweak symmetrybreaking and satisfies all relevant phenomenological constraints.Comment: 16 pages, 2 figures, version to appear in Phys. Rev.

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

Radiative GUT symmetry breaking in an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>-symmetric flipped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">SU</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>5</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>model

Radiative GUT symmetry breaking in anR-symmetric flippedSU(5)model