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Generalized Supersoft Supersymmetry Breaking and a Solution to the μ Problem.

Ann E Nelson1, Tuhin S Roy2,3

  • 1Department of Physics, University of Washington, Seattle, Washington 98195, USA.

Physical Review Letters
|June 6, 2015
PubMed
Summary

We introduce a generalized supersoft supersymmetry breaking framework. This new model addresses challenges in Higgs boson mass and naturalness, offering solutions to complex issues in supersoft models.

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Area of Science:

  • High Energy Physics
  • Theoretical Physics
  • Particle Physics

Background:

  • Supersoft models offer advantages over the Minimal Supersymmetric Standard Model (MSSM) by easing LHC constraints and resolving flavor/CP issues.
  • Existing supersoft models face challenges in naturally obtaining the Higgsino mass parameter (μ) and achieving the observed 125 GeV Higgs boson mass.
  • Supersoft models can suffer from color breaking and large T parameters due to new adjoint scalars.

Purpose of the Study:

  • To propose a generalized supersoft supersymmetry breaking framework.
  • To resolve existing challenges in supersoft models, including Higgs boson mass, naturalness of the μ term, and issues with adjoint scalars.
  • To introduce novel operators that address these limitations.

Main Methods:

  • Introduction of new operators into the supersoft model framework.
  • Modification of the Higgs sector to allow for unequal masses for up- and down-type Higgs fields.
  • Analysis of the implications for Higgsino masses and the T parameter.

Main Results:

  • The proposed framework potentially solves issues related to Higgs boson mass and the naturalness of the μ term.
  • The new μ term can lead to unequal masses for up- and down-type Higgs fields.
  • Higginos can be significantly heavier than the Higgs boson without fine-tuning, though this may alter some attractive supersoft features.

Conclusions:

  • The generalized supersoft supersymmetry breaking framework offers a potential solution to several outstanding problems in supersoft models.
  • The novel mechanism for the μ term provides flexibility in Higgs and Higgsino masses.
  • Further investigation is needed to fully understand the implications of unequal Higgs and Higgsino masses.