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Additional stringy sources for electric dipole moments.

S Abel1, S Khalil, O Lebedev

  • 1IPPP, University of Durham, South Road, Durham DH1 3LE, United Kingdom.

Physical Review Letters
|September 13, 2002
PubMed
Summary
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String models with low-energy supersymmetry predict large electric dipole moments (EDMs) due to nonuniversal couplings. The non-observation of EDMs suggests specific patterns in string theory

Area of Science:

  • High Energy Physics
  • String Theory
  • Supersymmetry

Background:

  • String models with low-energy supersymmetry are explored for their implications on particle physics.
  • The fermion mass hierarchy and its connection to supersymmetry breaking are key considerations.

Purpose of the Study:

  • To investigate the predictions of string models with low-energy supersymmetry regarding fermion electric dipole moments (EDMs).
  • To analyze the impact of nonuniversal soft trilinear couplings (A terms) and the Cabibbo-Kobayashi-Maskawa (CKM) phase on EDMs.

Main Methods:

  • Theoretical analysis of string models incorporating low-energy supersymmetry.
  • Examination of the relationship between nonuniversal soft trilinear couplings, the CKM phase, and EDMs.
  • Consideration of scenarios with and without CP violating phases in supersymmetry breaking.

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Main Results:

  • String models with low-energy supersymmetry and fermion mass hierarchy generally lead to nonuniversal soft trilinear couplings.
  • These nonuniversal couplings, combined with a large CKM phase, predict significant fermion EDMs.
  • Large EDMs are predicted even without CP violation in supersymmetry breaking fields.

Conclusions:

  • The non-observation of large fermion EDMs places constraints on string models.
  • These results imply that string theory likely selects specific flavor and/or supersymmetry breaking patterns.
  • Further investigation is needed to reconcile theoretical predictions with experimental limits on EDMs.