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Superpotential de-sequestering in string models
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik. Stockholm University.ORCID-id: 0000-0001-9611-2450
Oxford University, UK.
Cornell University, USA.
Oxford University, UK.
2013 (engelsk)Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 18, nr FebruaryArtikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Berlin: Springer, 2013. Vol. 18, nr February
Emneord [en]
Supersymmetry Breaking, Compactification and String Models, Intersecting branes models, Conformal Field Models in String Theory
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
URN: urn:nbn:se:kau:diva-26947DOI: 10.1007/JHEP02(2013)018ISI: 000316272900018OAI: oai:DiVA.org:kau-26947DiVA, id: diva2:616208
Tilgjengelig fra: 2013-04-15 Laget: 2013-04-15 Sist oppdatert: 2019-07-11bibliografisk kontrollert

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