# D-instanton generated Dirac neutrino masses

@article{Cveti2008DinstantonGD,
title={D-instanton generated Dirac neutrino masses},
author={Mirjam Cveti{\vc} and Paul Langacker},
journal={Physical Review D},
year={2008},
volume={78},
pages={066012}
}
• Published 19 March 2008
• Physics
• Physical Review D
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 ${Z}_{2}\ifmmode\times\else\texttimes\fi{}{Z}_{2}^{\ensuremath{'}}$ orientifold compactification, where perturbatively absent Dirac…
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