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2008

D-Instanton Generated Dirac Neutrino Masses

Cvetic, Mirjam, Langacker, Paul

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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.

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G. Cleaver, M. Cvetič, J. R. Espinosa, L. L. Everett and P. Langacker, Phys. Rev. D 57
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M. Cvetič, G. Shiu and A. M. Uranga, Nucl. Phys. B 615
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M. Cvetič, I. Papadimitriou and G. Shiu, Nucl. Phys. B 659
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M. Cvetič and I. Papadimitriou, Phys. Rev. D 68
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R. Blumenhagen, M. Cvetič, P. Langacker and G. Shiu, Ann. Rev. Nucl. Part. Sci. 55
2005
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2007

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