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2 years ago

On mass hierarchies in Orientifolds

On mass hierarchies in Orientifolds

“Bad” terms• A

“Bad” terms• A bonus: undesired terms could be absent due to the extendedsymmetries.• So, apart from the mass terms, some extra terms could be present:H u H d , QDL , DDU , LEL , H u H d ν , H d EH d , ννν• However, now they can be present due to instantonic effect.• There are non-dangerous and dangerous terms (for small M s ).• All 8 bottom-up models have no dangerous terms.Sunday, July 5, 2009

Conclusions• Open string textures are different from the traditional ones.• Yukawa-, Higher- and Instantonic-terms can generate the fullhierarchy of the Standard Model: From the t-quark down toneutrinos.• Undesired terms can be eliminated without problems due tothe extended additional U(1) symmetries.• Search for optimal embeddings in consistent orientifolds(with cancelled tadpoles) is very interesting (and in progress).Sunday, July 5, 2009

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