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Updated: Dec 13, 2025

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Cornering Spontaneous CP Violation with Charged-Higgs-Boson Searches
Ulrich Nierste1, Mustafa Tabet1, Robert Ziegler1
1Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe, Germany.
CP violation may arise from spontaneous symmetry breaking, not just the Kobayashi-Maskawa phase. This study explores a two-Higgs-doublet model, constraining Higgs masses and suggesting new search strategies for charged Higgs bosons.
Area of Science:
- High Energy Physics
- Particle Physics
- Quantum Field Theory
Background:
- The Kobayashi-Maskawa phase is the established source of charge-parity (CP) violation in weak quark decays.
- An alternative mechanism for CP violation involves spontaneous symmetry breaking in Higgs sectors with CP-conserving Yukawa matrices.
Purpose of the Study:
- To investigate CP violation originating from spontaneous symmetry breaking within a generic two-Higgs-doublet model.
- To derive theoretical constraints on model parameters and Higgs boson masses.
- To identify potential search strategies for the charged Higgs boson at colliders.
Main Methods:
- Theoretical analysis of a two-Higgs-doublet model.
- Derivation of constraints on the ratio of vacuum expectation values (t_β).
- Calculation of upper bounds for charged and neutral Higgs boson masses.
- Determination of lower bounds on charged Higgs couplings to bottom quarks.
Main Results:
- Theoretical constraints restrict the ratio t_β to the range [0.22, 4.5].
- Upper bounds are established for Higgs boson masses: M_{H^{±}} ≤ 435 GeV, M_{H_{2}^{0}} ≤ 485 GeV, and M_{H_{3}^{0}} ≤ 545 GeV.
- Lower bounds on charged Higgs couplings to bottom quarks are derived.
Conclusions:
- The study provides a theoretical framework for CP violation via spontaneous symmetry breaking in two-Higgs-doublet models.
- The derived bounds on Higgs masses and couplings motivate searches for nonstandard charged Higgs production and decay signatures.
- Benchmark scenarios with discovery potential at colliders are presented.
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