Taming ε K in little Randall-Sundrum models

The Randall Sundrum models receive significant constraints from the neutral kaon system. The CP violating observable εK, in the Randall Sundrum scenario, requires the lightest KK gluon to be heavier than ∼ 24     TeV . The constraint is even stronger in the little Randall Sundrum (LRS) models, ≳ 32...

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Bibliographic Details
Published in:Physical review. D 2021-09, Vol.104 (5), p.1, Article 055012
Main Authors: D’Ambrosio, Giancarlo, Arun, Mathew Thomas, Kushwaha, Ashwani, Vempati, Sudhir K.
Format: Article
Language:English
Subjects:
Constraint modelling
Flavor (particle physics)
Gluons
Kaons
Visibility
Wave functions
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Summary:The Randall Sundrum models receive significant constraints from the neutral kaon system. The CP violating observable εK, in the Randall Sundrum scenario, requires the lightest KK gluon to be heavier than ∼ 24     TeV . The constraint is even stronger in the little Randall Sundrum (LRS) models, ≳ 32     TeV. The LRS models are motivated for their possible visibility at the LHC. We show that the stringent constraints from K physics can be relaxed in the LRS models, in the presence of the brane localized kinetic terms (BLKT). In particular, for a range of values, a UV BLKT could significantly modify the lightest K K gluon wave function such that the limit can reduces to 5 TeV. We also show that such a relaxation of the constraints can also be achieved by imposing flavor symmetries à la minimal flavor protection.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.055012