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}
}
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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