D-brane instanton induced μ terms and their hierarchical structure

  title={D-brane instanton induced $\mu$ terms and their hierarchical structure},
  author={Hiroyuki Abe and Tatsuo C. Kobayashi and Yoshiyuki Tatsuta and Shohei Uemura},
  journal={Physical Review D},
We study the $\ensuremath{\mu}$-term matrix of Higgs pairs induced by the D-brane instanton effects in intersecting D6-brane models compactified on ${T}^{6}$. It is found that the $\ensuremath{\mu}$-term matrix has a certain permutation symmetry and its eigenvalues have large hierarchical structure without fine-tuning. 

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