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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
PubMed
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.

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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.

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  • 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.