D-Instanton Generated Dirac Neutrino Masses

Abstract

We present a stringy mechanism to generate Dirac neutrino masses by D-instantons in an experimentally relevant mass scale without fine-tuning. Within Type IIA string theory with intersecting D6-branes, we spell out specific conditions for the emergence of such couplings and provide a class of supersymmetric local SU(5) Grand Unified models, based on the Z_2 x Z'_2 orientifold compactification, where perturbatively absent Dirac neutrino masses can be generated by D2-brane instantons in the experimentally observed mass regime, while Majorana masses remain absent, thus providing an intriguing mechanism for the origin of small neutrino masses due to non-perturbative stringy effects.

4 pages, 1 figure minor corrections, the version to be published in Phys. Rev. D

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Cited by in corpus (25)

• D-brane Instantons in Type II String Theory
• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Gauge Mediation in F-Theory GUT Models
• Realistic Yukawa Structures from Orientifold Compactifications
• Implications of String Constraints for Exotic Matter and Z' s Beyond the Standard Model
• String Constraints on Discrete Symmetries in MSSM Type II Quivers
• An MSSM Extension with a Mirror Fourth Generation, Neutrino Magnetic Moments and LHC Signatures
• The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
• Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
• TASI Lectures: Particle Physics from Perturbative and Non-perturbative Effects in D-braneworlds
• Neutrino Masses from the Top Down
• SU(5) D-brane realizations, Yukawa couplings and proton stability
• Singlet Extensions of the MSSM in the Quiver Landscape
• Dynamical Majorana Neutrino Masses and Axions
• Anomalous dimensions from Yukawa couplings in SMNEFT: four-fermion operators
• TeV-Scale strings
• Instanton induced charged fermion and neutrino masses in a minimal Standard Model scenario from intersecting D-branes
• Ultraviolet Completions of Axigluon Models and Their Phenomenological Consequences
• Stringy instanton effects in N=2 gauge theories
• On Fermion Mass Hirerachies in MSSM-like Quiver Models with Stringy Corrections
• Fermion masses and mixings in the supersymmetric Pati-Salam landscape from Intersecting D6-Branes
• Minimal embedding of the Standard Model into intersecting D-brane configurations with a bulk leptonic $U(1)$
• Fermion Masses and Mixings in String Theory with Dirac Neutrinos
• Right-handed neutrinos, domain walls and tadpoles in the superstring inspired $\mu \nu$SSM
• E2 Instanton Effects and Higgs Physics In Intersecting Brane Models