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Superpotential de-sequestering in string models
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics. Stockholm University.
Oxford University, UK.
Cornell University, USA.
Oxford University, UK.
2013 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 18, no FebruaryArticle in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Berlin: Springer, 2013. Vol. 18, no February
Keyword [en]
Supersymmetry Breaking, Compactification and String Models, Intersecting branes models, Conformal Field Models in String Theory
National Category
Natural Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-26947DOI: 10.1007/JHEP02(2013)018ISI: 000316272900018OAI: oai:DiVA.org:kau-26947DiVA: diva2:616208
Available from: 2013-04-15 Created: 2013-04-15 Last updated: 2016-08-25Bibliographically approved

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Berg, Marcus
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