Computation of D-brane instanton induced superpotential couplings - Majorana masses from string theory

Abstract

We perform a detailed conformal field theory analysis of D2-brane instanton effects in four-dimensional type IIA string vacua with intersecting D6-branes. In particular, we explicitly compute instanton induced fermion two-point couplings which play the role of perturbatively forbidden Majorana mass terms for right-handed neutrinos or MSSM mu-terms. These results can readily be extended to higher-dimensional operators. In concrete realizations of such non-perturbative effects, the Euclidean D2-brane has to wrap a rigid, supersymmetric cycle with strong constraints on the zero mode structure. Their implications for Type IIA compactifications on the T^6/(Z_2 x Z_2) orientifold with discrete torsion are analyzed. We also construct a local supersymmetric GUT-like model allowing for a class of Euclidean D2-branes whose fermionic zero modes meet all the constraints for generating Majorana masses in the phenomenologically allowed regime. Together with perturbatively realized Dirac masses, these non-perturbative couplings give rise to the see-saw mechanism.

33 pages, 4 figures; v2: minor corrections and clarifications added

References in corpus (11)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
• Neutrino Majorana Masses from String Theory Instanton Effects
• Stringy Instantons and Quiver Gauge Theories
• Gaugino Condensates and D-terms from D7-branes
• Progress in D-brane model building
• Non-perturbative SQCD Superpotentials from String Instantons
• Proton decay via dimension-six operators in intersecting D6-brane models
• Intersecting D-Branes on Shift Z2 x Z2 Orientifolds
• MSSM via Pati-Salam from Intersecting Branes on $T^6/({\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime })$
• Derivative F-Terms from Heterotic M-Theory Five-brane Instantons

Cited by in corpus (50)

• GUTs in Type IIB Orientifold Compactifications
• Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra
• Non-perturbative Yukawa Couplings from String Instantons
• Stringy Instantons at Orbifold Singularities
• D-brane Instantons on the T^6/Z_3 orientifold
• Gauge Mediation in F-Theory GUT Models
• Instanton Induced Open String Superpotentials and Branes at Singularities
• Stringy Instantons and Cascading Quivers
• Lifting D-Instanton Zero Modes by Recombination and Background Fluxes
• Instanton effects in N=1 brane models and the Kahler metric of twisted matter
• Power Towers of String Instantons for N=1 Vacua
• Thresholds for Intersecting D-branes Revisited
• Instantons in N=2 magnetized D-brane worlds
• Realistic Yukawa Textures and SUSY Spectra from Intersecting Branes
• Hierarchies from D-brane instantons in globally defined Calabi-Yau Orientifolds
• String instantons, fluxes and moduli stabilization
• Large Field Inflation from Axion Mixing
• D-Instanton Generated Dirac Neutrino Masses
• The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
• On mass hierarchies in orientifold vacua
• Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
• Gauge Thresholds and Kaehler Metrics for Rigid Intersecting D-brane Models
• D-instanton Induced Superpotential
• SU(5) D-brane realizations, Yukawa couplings and proton stability
• String GUT Scenarios with Stabilised Moduli
• The Supersymmetry Breaking Soft Terms, and Fermion Masses and Mixings in the Supersymmetric Pati-Salam Model from Intersecting D6-branes
• D-brane instanton effects in Type II orientifolds: local and global issues
• D-brane Instantons in 4D Supersymmetric String Vacua
• D-instanton, threshold corrections, and topological string
• Towards a realistic Standard Model from D-brane configurations
• Circling the Square: Deforming fractional D-branes in Type II/$\Omega \mathcal{R}$ orientifolds
• Supersymmetric models on magnetized orbifolds with flux-induced Fayet-Iliopoulos terms
• D-brane instanton induced mu-terms and their hierarchical structure
• Poly-instanton axion inflation
• Modular symmetry anomaly and non-perturbative neutrino mass terms in magnetized orbifold models
• Neutrino Masses, Baryon Asymmetry, Dark Matter and the Moduli Problem : A Complete Framework
• Non-Perturbative Effects on a Fractional D3-Brane
• Fermion masses and mixings in the supersymmetric Pati-Salam landscape from Intersecting D6-Branes
• Multi-Instanton Corrections to Superpotentials in Type II Compactifications
• Dynamical Supersymmetry Breaking in Intersecting Brane Models
• N=2 Instanton Calculus In Closed String Background
• Susy breaking soft terms in the supersymmetric Pati-Salam landscape from Intersecting D6-Branes
• Stabilizing the Runaway Quiver in Supergravity
• Fermion Masses and Mixings in String Theory with Dirac Neutrinos
• Testing B-violating signatures from Exotic Instantons in future colliders
• One-loop and D-instanton corrections to the effective action of open string models
• Right-handed neutrinos, domain walls and tadpoles in the superstring inspired $\mu \nu$SSM
• The 1932 Majorana equation: a forgotten but surprisingly modern particle theory
• Axions in Type IIA Superstring Theory and Dark Matter
• E2 Instanton Effects and Higgs Physics In Intersecting Brane Models