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Electroweak baryogenesis in a supersymmetric U(1)' model.
Junhai Kang1, Paul Langacker, Tianjun Li
1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396, USA.
Physical Review Letters
|March 24, 2005
Summary
This study presents a supersymmetric U(1)' model enabling strong electroweak phase transitions for baryogenesis. A novel secluded sector generates the observed baryon number via tau lepton contributions.
Area of Science:
- Particle Physics
- Cosmology
- Supersymmetry
Background:
- Electroweak baryogenesis (EWBG) requires a strong first-order phase transition.
- The Minimal Supersymmetric Standard Model (MSSM) often fails to provide a sufficiently strong transition.
- A U(1)' extension offers new possibilities for EWBG.
Purpose of the Study:
- To construct an anomaly-free supersymmetric U(1)' model with a secluded sector.
- To investigate the electroweak phase transition and baryogenesis within this model.
- To explore the role of the secluded sector and tau lepton contributions.
Main Methods:
- One-loop effective potential calculation at finite temperature.
- Analysis of the tree-level Higgs potential, including the AhhSHdHu term.
- Study of the nonlocal EWBG mechanism in the thin wall regime.
Main Results:
- A strong first-order electroweak phase transition is achieved due to a large trilinear Higgs term.
- The lightest top squark can be significantly heavier than in the MSSM.
- The observed baryon number can be generated by tau lepton contributions, with the secluded sector being crucial.
Conclusions:
- The proposed U(1)' model provides a viable framework for electroweak baryogenesis.
- The secluded sector plays an essential role in generating the baryon asymmetry.
- Further implications for Z' boson mass and electric dipole moments warrant investigation.