Superpotential de-sequestering in string models
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
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.
Supersymmetry Breaking, Compactification and String Models, Intersecting branes models, Conformal Field Models in String Theory
IdentifiersURN: urn:nbn:se:su:diva-89787DOI: 10.1007/JHEP02(2013)018ISI: 000316272900018OAI: oai:DiVA.org:su-89787DiVA: diva2:620545