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We show that in O'Raifeartaigh models of spontaneous supersymmetry breaking,R-symmetries can be broken by non-zero values of fields at tree level, ratherthan by vacuum expectation values of pseudomoduli at loop level. As acomplement of the recent result by Shih, we show that there must be a field inthe theory with R-charge different from zero and two in order for R-symmetrybreaking to occur, no matter whether the breaking happens at tree or looplevel. We review the example by CDFM, and construct two types of tree levelR-symmetry breaking models with a wide range of parameters and free of runawayproblem. And the R-symmetry is broken everywhere on the pseudomoduli space inthese models. This provides a rich set of candidates for SUSY model buildingand phenomenology.

Tree level spontaneous R-symmetry breaking in O'Raifeartaigh models