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Article overview
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Superpotential de-sequestering in string models | | Marcus Berg
; Joseph P. Conlon
; David Marsh
; Lukas T. Witkowski
; | | Date: |
4 Jul 2012 | | Abstract: | Non-perturbative superpotential cross-couplings between visible sector matter
and K"ahler 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-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. | | Source: | arXiv, 1207.1103 | | Services: | Forum | Review | PDF | Favorites | |
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