Superpotential de-sequestering in string models
2013 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 18, no FebruaryArticle in journal (Refereed) Published
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
Supersymmetry Breaking, Compactification and String Models, Intersecting branes models, Conformal Field Models in String Theory
Research subject Physics
IdentifiersURN: urn:nbn:se:kau:diva-26947DOI: 10.1007/JHEP02(2013)018ISI: 000316272900018OAI: oai:DiVA.org:kau-26947DiVA: diva2:616208