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arXiv · 1207.1103

Superpotential de-sequestering in string models

Marcus Berg·Joseph P. Conlon·David Marsh·Lukas T. Witkowski
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Abstract

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-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.

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Marcus Berg, Joseph P. Conlon, David Marsh, Lukas T. Witkowski. 2012-07-04. Superpotential de-sequestering in string models. https://doi.org/10.1007/jhep02(2013)018

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