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Leptogenesis from supersymmetry breaking.

Yuval Grossman1, Tamar Kashti, Yosef Nir

  • 1Department of Physics, Technion-Israel Institute of Technology, Technion City, 32000 Haifa, Israel.

Physical Review Letters
|February 3, 2004
PubMed
Summary
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Soft supersymmetry breaking terms involving heavy sneutrinos cause sneutrino-antisneutrino mixing and new CP violation sources. This mechanism can generate a significant baryon asymmetry, potentially dominating traditional leptogenesis scenarios.

Area of Science:

  • Particle Physics
  • Cosmology
  • Supersymmetry

Background:

  • Supersymmetry (SUSY) is a theoretical framework extending the Standard Model.
  • Leptogenesis is a leading mechanism for explaining the matter-antimatter asymmetry in the universe.
  • CP violation is essential for generating a baryon asymmetry.

Purpose of the Study:

  • To investigate the implications of soft supersymmetry breaking terms involving heavy sneutrinos.
  • To explore new sources of CP violation beyond standard models.
  • To analyze the generation of baryon asymmetry through these new mechanisms.

Main Methods:

  • Analysis of soft supersymmetry breaking terms in supersymmetric theories.
  • Study of sneutrino-antisneutrino mixing.

Related Experiment Videos

  • Investigation of CP violation in heavy sneutrino decays.
  • Calculation of baryon asymmetry generation.

    • Main Results:

    • Soft supersymmetry breaking terms involving heavy sneutrinos induce sneutrino-antisneutrino mixing.
    • New sources of CP violation arise, even for a single generation.
    • Indirect CP violation in heavy sneutrino decays generates a baryon asymmetry.
    • This contribution can be comparable to or larger than traditional leptogenesis.

    Conclusions:

    • Soft supersymmetry breaking terms offer a viable mechanism for generating baryon asymmetry.
    • This mechanism provides a new perspective on leptogenesis and CP violation.
    • The findings have implications for understanding the early universe and particle physics beyond the Standard Model.