Dipole operator constraints on composite Higgs models

Abstract

Flavour- and CP-violating electromagnetic or chromomagnetic dipole operators in the quark sector are generated in a large class of new physics models and are strongly constrained by measurements of the neutron electric dipole moment and observables sensitive to flavour-changing neutral currents, such as the $B\to X_s\gamma$ branching ratio and ${\epsilon }^{\prime }/\epsilon$. After a model-independent discussion of the relevant constraints, we analyze these effects in models with partial compositeness, where the quarks get their masses by mixing with vector-like composite fermions. These scenarios can be seen as the low-energy limit of composite Higgs or warped extra dimensional models. We study different choices for the electroweak representations of the composite fermions motivated by electroweak precision tests as well as different flavour structures, including flavour anarchy and $U(3{)}^3$ or $U(2{)}^3$ flavour symmetries in the strong sector. In models with "wrong-chirality" Yukawa couplings, we find a strong bound from the neutron electric dipole moment, irrespective of the flavour structure. In the case of flavour anarchy, we also find strong bounds from flavour-violating dipoles, while these constraints are mild in the flavour-symmetric models.

30 pages, 2 figures, 11 tables. v3: Misprints in table 8 corrected. Numerics and conclusions unchanged

References in corpus (13)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• A custodial symmetry for Zbb
• Light custodians in natural composite Higgs models
• The Flavor of the Composite Pseudo-Goldstone Higgs
• Flavor Physics in the Randall-Sundrum Model: I. Theoretical Setup and Electroweak Precision Tests
• Delta F=2 Observables and Fine-Tuning in a Warped Extra Dimension with Custodial Protection
• Vector-like leptons: Higgs decays and collider phenomenology
• On Partial Compositeness and the CP asymmetry in charm decays
• Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation
• A GIM Mechanism from Extra Dimensions
• The birds and the Bs in RS: the b to s gamma penguin in a warped extra dimension

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