Speaker
Description
We explore the natural grand unified theory (GUT) with spontaneous supersymmetry
(SUSY) breaking, focusing on the contribution to sfermion and Higgs masses. Natural GUTs, which introduce all terms allowed by SO(10) × U (1)A symmetry with O(1) coefficients, provide a solution to the problems in SUSY GUTs. Although it is also possible to introduce spontaneous SUSY breaking, it predicts D-term contribution to sfermion and Higgs masses dominates the F-term contribution, that potentially leads to the SUSY flavor problem. Fortunately, it also predicts high-scale SUSY, which avoids the SUSY flavor problem but leads to the need for fine-tuning to obtain the electroweak scale and predicts superheavy Higgsino mass unless the D-term contribution becomes comparable with the F-term contribution. We discuss whether it is possible to suppress
the D-term contribution while maintaining the F-term contribution through the tuning of O(1) coefficients in the natural GUT with spontaneous SUSY breaking. Our results indicate that it is impossible. This also suggests that the Higgsino is not a candidate for dark matter in the scenario.
