Composite Higgs-Mediated FCNC

Abstract

We discuss how, in the presence of higher-dimensional operators, the Standard Model (SM) fermion masses can be misaligned in flavor space with the Yukawa couplings to the Higgs boson, even with only one Higgs doublet. Such misalignment results in flavor-violating couplings to the Higgs and hence flavor-changing neutral current (FCNC) processes from tree-level Higgs exchange. We perform a model-independent analysis of such an effect. Specializing to the framework of a composite Higgs with partially composite SM gauge and fermion fields, we show that the constraints on the compositeness scale implied by epsilon_K can be generically as strong as those from the exchange of heavy spin-1 resonances if the Higgs is light and strongly coupled to the new states. In the special and well motivated case of a composite pseudo-Goldstone Higgs, we find that the shift symmetry acting on the Higgs forces an alignment of the fermion mass terms with their Yukawa couplings at leading order in the fermions' degree of compositeness, thus implying much milder bounds. As a consequence of the flavor-violating Higgs couplings, we estimate BR(t -> c h) ~ 10^{-4} and BR(h -> tc) ~ 5 x 10^{-3} both for a pseudo-Goldstone (if t_R is fully composite) and for a generic composite Higgs. By virtue of the AdS/CFT correspondence, our results directly apply to 5-dimensional Randall-Sundrum compactifications.

14 pages; v2: important change in the model-independent analysis of section 2, a comment added in the conclusions on how our results are modified by relaxing the assumptions of linear couplings and flavor anarchy. A few typos corrected, two references added. All conclusions unchanged. Version published in PRD

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• The Discrete Composite Higgs Model
• On Partial Compositeness and the CP asymmetry in charm decays
• Search for lepton-flavour-violating decays of the Higgs and $Z$ bosons with the ATLAS detector
• Prospects for charged Higgs searches at the LHC
• Light Custodians and Higgs Physics in Composite Models
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• Search for lepton-flavour-violating $H\to \mu \tau$ decays of the Higgs boson with the ATLAS detector
• An A4 flavor model for quarks and leptons in warped geometry
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• FCNC Effects in a Minimal Theory of Fermion Masses
• Ultra Visible Warped Model From Flavor Triviality & Improved Naturalness
• Search for lepton flavour violating decays of the Higgs boson to e tau and e mu in proton-proton collisions at sqrt(s) = 8 TeV
• Search for lepton flavour violating decays of the Higgs boson to $\mu \tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for lepton-flavor violating decays of the Higgs boson in the $\mu \tau$ and e$\tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Searches for lepton-flavour-violating decays of the Higgs boson in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Higgs Production from Gluon Fusion in Warped Extra Dimensions
• Higgs Couplings in Composite Models
• Nonstandard Yukawa Couplings and Higgs Portal Dark Matter
• Flavor Alignment via Shining in RS
• On the Flavor Structure of Natural Composite Higgs Models & Top Flavor Violation
• Warped Penguins
• Higgs Flavor Violation as a Signal to Discriminate Models
• $\Delta F=1$ constraints on composite Higgs models with LR parity
• Top Partners and Higgs Boson Production
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• Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t\to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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• Lepton Flavour Violating top decays at the LHC
• Top quark FCNCs in extended Higgs sectors
• Direct and Indirect Searches for Top-Higgs FCNC Couplings
• Search for lepton flavour violating decays of a neutral heavy Higgs boson to $\mu \tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• On the Structure of Anomalous Composite Higgs Models
• Supersymmetry with a pNGB Higgs and Partial Compositeness
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• The Lepton Sector of a Fourth Generation
• Lepton Flavour Violation in Composite Higgs Models
• Flavour Physics in the Soft Wall Model
• Searches for lepton-flavour-violating decays of the Higgs boson into $e\tau$ and $\mu \tau$ in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Search for the lepton-flavor violating decay of the Higgs boson and additional Higgs bosons in the e$\mu$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• 125 GeV Higgs decay with lepton flavor violation in the $\mu \nu$SSM
• Searches for top-Higgs FCNC couplings via the Whj signal with $h\to \gamma \gamma$ at the LHC
• $t\to cg$ and $t\to cZ$ in Universal Extra Dimensional Models
• Constraints on top quark flavor changing neutral currents using diphoton events at the LHC
• Probing light top partners with CP violation
• Quark flavour-violating Higgs decays at the ILC
• Top Quark Rare Decays via Loop-Induced FCNC Interactions in Extended Mirror Fermion Model
• Lepton Flavor Changing Higgs decays in the Littlest Higgs Model with T-parity
• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• A Concrete Composite 2-Higgs Doublet Model
• Higgs boson decays with lepton flavor violation in the $B-L$ symmetric SSM
• Constraining Lepton Flavor Violating Higgs Couplings at the HL-LHC in the Vector Boson Fusion Channel
• The Techni-Pati-Salam Composite Higgs
• Anarchy with linear and bilinear interactions
• Search for flavor-changing neutral $tqH$ interactions with $H\to \gamma \gamma$ in $pp$ collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
• Search for lepton-flavour-violating decays of Higgs-like bosons
• A Comparative Study of Contributions to ${\epsilon }_K$ in the RS Model
• TASI 2009 Lectures - Flavor Physics
• Bounding the B_s -> gamma gamma decay from Higgs mediated FCNC transitions
• Flavour-changing Higgs decays into bottom and strange quarks in supersymmetry
• Exploring the Flavor Symmetry Landscape
• Same-sign top pair plus $W$ production in flavor changing vector and scalar models
• Radion Phenomenology with 3 and 4 Generations
• Saving the fourth generation Higgs with radion mixing
• Higgs Production in General 5D Warped Models
• Higgs Phenomenology in Warped Extra-Dimensions with a 4th Generation
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• Top Rare Decays t-> cV in the Mirror Twin Higgs Models
• Charged lepton flavor violation in extended BLMSSM
• Improved Bounds and Global Fit of Flavor-Violating Charged Lepton Yukawa Couplings post LHC
• The Lepton Flavor Changing Decays and One-loop Muon Anomalous Magnetic Moment in the Extended Mirror Twin Higgs Models
• From hidden symmetry to extra dimensions: a five dimensional formulation of the Degenerate BESS model
• A Simplified Model of Heavy Vector Singlets for the LHC and Future Colliders
• Constraints on Models with Warped Extra Dimensions
• Interpretation of LHC excesses in ditop and ditau channels as a 400-GeV pseudoscalar resonance
• Novel and Updated Bounds on Flavor-Violating Z Interactions in the Quark Sector