Journal of High Energy Physics

, 2013:18 | Cite as

Superpotential de-sequestering in string models

  • Marcus Berg
  • Joseph P. Conlon
  • David Marsh
  • Lukas T. WitkowskiEmail author


Non-perturbative superpotential cross-couplings between visible sector matter and Kähler moduli can lead to significant flavour-changing neutral currents in compactifications of type IIB string theory. Here, we compute corrections to Yukawa couplings in orbifold models with chiral matter localised on D3-branes and non-perturbative effects on distant D7-branes. By evaluating a threshold correction to the D7-brane gauge coupling, we determine conditions under which the non-perturbative corrections to the Yukawa couplings appear. The flavour structure of the induced Yukawa coupling generically fails to be aligned with the tree-level flavour structure. We check our results by also evaluating a correlation function of two D7-brane gauginos and a D3-brane Yukawa coupling. Finally, by calculating a string amplitude between n hidden scalars and visible matter we show how non-vanishing vacuum expectation values of distant D7-brane scalars, if present, may correct visible Yukawa couplings with a flavour structure that differs from the tree-level flavour structure.


Supersymmetry Breaking Compactification and String Models Intersecting branes models Conformal Field Models in String Theory 


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Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  • Marcus Berg
    • 1
    • 2
  • Joseph P. Conlon
    • 3
  • David Marsh
    • 4
  • Lukas T. Witkowski
    • 3
    Email author
  1. 1.Department of PhysicsKarlstad UniversityKarlstadSweden
  2. 2.Oskar Klein CenterStockholm University, Albanova University CenterStockholmSweden
  3. 3.Rudolf Peierls Centre for Theoretical PhysicsUniversity of OxfordOxfordU.K
  4. 4.Department of PhysicsCornell UniversityIthacaU.S.A

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