Anatomy of flavour-changing Z couplings in models with partial compositeness

A bstract In models with partially composite quarks, like composite Higgs models or models with a warped extra dimension, the couplings of quarks to the Z boson generically receive non-universal corrections that are not only constrained by electroweak precision tests but also lead to flavour-changin...

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Bibliographic Details
Published in:The journal of high energy physics 2013-08, Vol.2013 (8), p.1-22, Article 108
Main Author: Straub, David M.
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Couplings
Decay
Elementary Particles
High energy physics
Invariants
Mathematical models
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Relativity Theory
Samples
Statistical methods
Statistics
String Theory
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Summary:A bstract In models with partially composite quarks, like composite Higgs models or models with a warped extra dimension, the couplings of quarks to the Z boson generically receive non-universal corrections that are not only constrained by electroweak precision tests but also lead to flavour-changing neutral currents at tree level. The impact of these flavour-changing couplings on rare K and B decays is studied in two-site models for three scenarios: an anarchic strong sector with two different choices of fermion representations both leading to a custodial protection of the coupling, and for a strong sector invariant under a U(2) 3 flavour symmetry. In the complete numerical analysis, all relevant constraints from Δ F = 2 processes are taken into account. In all scenarios, visible effects in rare K and B decays like , B s → μ + μ − and B → K ∗ μ + μ − are possible that can be scrutinized experimentally in the near future. Characteristic correlations between observables allow to distinguish the different cases. To sample the large parameter space of the anarchic models, a new method is presented that allows larger statistics than conventional approaches.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP08(2013)108