D-Instanton Generated Dirac Neutrino Masses

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dc.creatorCvetic, Mirjam
dc.creatorLangacker, Paul
dc.date2008-03-19
dc.date2008-09-16
dc.date.accessioned2026-07-07T12:44:32Z
dc.date.available2026-07-07T12:44:32Z
dc.descriptionWe 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.
dc.description4 pages, 1 figure minor corrections, the version to be published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0803.2876
dc.identifierhttp://arxiv.org/abs/0803.2876
dc.identifierPhys.Rev.D78:066012,2008
dc.identifierdoi:10.1103/PhysRevD.78.066012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220801
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleD-Instanton Generated Dirac Neutrino Masses
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