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Superpotential de-sequestering in string models
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2013 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 2, 018- p.Article in journal (Refereed) Published
Abstract [en]

Non-perturbative superpotential cross-couplings between visible sector matter and Kahler moduli can lead to significant flavour-changing neutral currents in compactifications of type JIB 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.

Place, publisher, year, edition, pages
2013. no 2, 018- p.
Keyword [en]
Supersymmetry Breaking, Compactification and String Models, Intersecting branes models, Conformal Field Models in String Theory
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-89787DOI: 10.1007/JHEP02(2013)018ISI: 000316272900018OAI: diva2:620545


Available from: 2013-05-08 Created: 2013-05-08 Last updated: 2013-05-08Bibliographically approved

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Berg, Marcus
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