J. High Energy Phys.

2002

DOI: 10.1088/1126-6708/2002/08/007

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Towards a Realistic Picture of CP Violation in Heterotic String Models

O. V. Lebedev¹,

Stephen Morris²

Abstract: We find that dilaton dominated supersymmetry breaking and spontaneous CP violation can be achieved in heterotic string models with superpotentials singular at the fixed points of the modular group. A semi-realistic picture of CP violation emerges in such models: the CKM phase appears due to a complex VEV of the T -modulus, while the soft supersymmetric CP phases are absent due to an axionic-type symmetry.

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Quark and Lepton Masses And Mixing Angles1

Small Cp Phases1

Introduction1

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Cited by 8 publications

(3 citation statements)

References 60 publications

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“…33. have an imaginary phase, which can occur when the flat moduli directions are lifted by supersymmetry breaking and find their minimum where the phases are nonzero 36,35,37 . Such a phase feeds directly into ε 5 .…”

Section: Quark and Lepton Masses And Mixing Anglesmentioning

confidence: 99%

A Kind of Prediction From String Phenomenology: Extra Matter at Low Energy

¹

2007

Mod. Phys. Lett. A

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We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E 8 × E 8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈ g GU T × 5.27 · 10 17 GeV) and the value deduced from LEP experiments (≈ 2 · 10 16 GeV), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet-Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable lebel. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.

“…33. have an imaginary phase, which can occur when the flat moduli directions are lifted by supersymmetry breaking and find their minimum where the phases are nonzero 36,35,37 . Such a phase feeds directly into ε 5 .…”

Section: Quark and Lepton Masses And Mixing Anglesmentioning

confidence: 99%

A Kind of Prediction From String Phenomenology: Extra Matter at Low Energy

¹

2007

Mod. Phys. Lett. A

View full text Add to dashboard Cite

We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E 8 × E 8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈ g GU T × 5.27 · 10 17 GeV) and the value deduced from LEP experiments (≈ 2 · 10 16 GeV), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet-Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable lebel. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.

“…First, we study the minimal SUGRA model (mSUGRA) with small (10 −2 ) CP phases. The smallness of the physical phases may be due to approximate alignment between the phases of the soft terms as occurs in the dilaton-domination scenario [36] with the Giudice-Masiero mechanism for the µ-term, or due to some approximate symmetry [37].…”

Section: Small Cp Phasesmentioning

confidence: 99%

Neutron-electron EDM correlations in supersymmetry and prospects for EDM searches

¹

,

²

2006

J. High Energy Phys.

Self Cite

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Motivated by recent progress in experimental techniques of electric dipole moment (EDM) measurements, we study correlations between the neutron and electron EDMs in common supersymmetric models. These include minimal supergravity (mSUGRA) with small CP phases, mSUGRA with a heavy SUSY spectrum, the decoupling scenario and split SUSY. In most cases, the electron and neutron EDMs are found to be observable in the next round of EDM experiments. They exhibit certain correlation patterns. For example, if d n ∼ 10 −27 e cm is found, d e is predicted to lie in the range 10 −28 − 10 −29 e cm.

“…Suppression of these unwanted effects requires rather special circumstances, e.g. dilaton domination with an approximate axial symmetry [20]. Other options to avoid overproduction of EDMs in SUSY models include heavy sfermions [21], the presence of extra dimensions [22], additional symmetries [23,24], etc.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole moments in the MSSM at large tanβ

¹

,

³

et al. 2004

Nuclear Physics B

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Within the minimal supersymmetric standard model (MSSM), the large tan β regime can lead to important modifications in the pattern of CP-violating sources contributing to low energy electric dipole moments (EDMs). In particular, four-fermion CP-violating interactions induced by Higgs exchange should be accounted for alongside the constituent EDMs of quarks and electrons. To this end, we present a comprehensive analysis of three low energy EDM observables -namely the EDMs of thallium, mercury and the neutronat large tan β, in terms of one-and two-loop contributions to the constituent EDMs and four-fermion interactions. We concentrate on the constrained MSSM as well as the MSSM with non-universal Higgs masses, and include the CP-violating phases of µ and A. Our results indicate that the atomic EDMs receive significant corrections from four-fermion operators, especially when Im(A) is the only CP-violating source, whereas the neutron EDM remains relatively insensitive to these effects. As a consequence, in a large portion of the parameter space, one cannot infer a separate bound on the electron EDM via the experimental constraint on the thallium EDM. Furthermore, we find that the electron EDM can be greatly reduced due to the destructive interference of one-and two-loop contributions with the latter being dominated by virtual staus.

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