D-Instanton Generated Dirac Neutrino Masses

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Physical Sciences and Mathematics
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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 Z2 × 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 nonperturbative stringy effects.

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2008-09-18
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Suggested Citation: M. Cvetič and P. Langacker. (2008). "D-instanton generated Dirac neutrino masses." Physical Review D. 78, 066012. © 2008 The American Physical Society http://dx.doi.org/10.1103/PhysRevD.78.066012
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