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  • Open Access

Does finetuning make D-term contributions smaller in natural grand unified theories with spontaneous supersymmetry breaking?

Nobuhiro Maekawa1,2,* and Taiju Tanii1,†

  • 1Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 2Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602, Japan

  • *Contact author: maekawa@eken.phys.nagoya-u.ac.jp
  • †Contact author: tanii.t@eken.phys.nagoya-u.ac.jp

Phys. Rev. D 112, 055016 – Published 12 September, 2025

DOI: https://doi.org/10.1103/qftw-p3tz

Abstract

In this paper, we explore the natural grand unified theory (GUT) with spontaneous supersymmetry (SUSY) breaking, focusing on the contribution to sfermion and Higgs masses. Natural GUTs solve various problems in SUSY GUTs with the natural assumption that all terms allowed by SO(10)×U(1)A symmetry are introduced with O(1) coefficients. It is also possible to introduce spontaneous SUSY breaking in the natural GUT. This scenario predicts that D-term contribution to sfermion and Higgs masses dominates the F-term contribution, which potentially leads to the SUSY flavor problem. Fortunately, it also predicts high-scale SUSY, which avoids the SUSY flavor problem but leads to the instability of the electroweak scale. The D-term domination results in the superheavy Higgsino, 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 mass spectrum of the sfermions can be predicted by the D-term contributions and that the Higgsino is not a candidate for dark matter in the scenario.

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