Novel flavour-changing neutral currents in the top quark sector

Abstract

We demonstrate that flavour-changing neutral currents in the top sector, mediated by leptophilic scalars at the electroweak scale, can easily arise in scenarios of new physics, and in particular in composite Higgs models. We moreover show that such interactions are poorly constrained by current experiments, while they can be searched for at the LHC in rare top decays and, more generally, in the channels $pp\to tS(S)+j$, with $S\to {\ell }^{+}{\ell }^{-}$. We provide dedicated analyses in this respect, obtaining that cut-off scales as large as $\Lambda \sim$ 90 TeV can be probed with an integrated luminosity of $\mathcal{L}=150$ fb${}^{-1}$.

arXiv comment25 pages, 9 figures

References in corpus (41)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Parton distributions with LHC data
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• The Next-to-Minimal Supersymmetric Standard Model
• Higgs as a Holographic Pseudo-Goldstone Boson
• Model-independent constraints on Delta F=2 operators and the scale of New Physics
• Flavor Violating Higgs Decays
• Composite Higgses
• Beyond the Minimal Composite Higgs Model
• Electroweak baryogenesis and gravitational waves from a real scalar singlet
• Gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis
• A unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures
• Electroweak Baryogenesis in Non-minimal Composite Higgs Models
• Probing top flavour-changing neutral scalar couplings at the CERN LHC
• A light complex scalar for the electron and muon anomalous magnetic moments
• Fundamental Composite 2HDM: SU(N) with 4 flavours
• Light scalars in composite Higgs models
• $h\to \gamma \gamma$ excess and Dark Matter from Composite Higgs Models
• Singlets in Composite Higgs Models in light of the LHC di-photon searches
• A Global View of the Off-Shell Higgs Portal
• Strong First Order EWPT and Strong Gravitational Waves in $Z_3$-symmetric Singlet Scalar Extension
• Spontaneous $CP$-Violating Electroweak Baryogenesis and Dark Matter from a Complex Singlet Scalar
• Composite Dynamics in the Early Universe
• Digamma, what next?
• Constraining four-fermion operators using rare top decays
• Constraining the flavor changing Higgs couplings to the top-quark at the LHC
• Searches for vector-like quarks at future colliders and implications for composite Higgs models with dark matter
• An operator basis for the Standard Model with an added scalar singlet
• Top quark FCNCs in extended Higgs sectors
• On the Structure of Anomalous Composite Higgs Models
• Composite Higgses with seesaw EWSB
• Rare top quark decays at a 100 TeV proton-proton collider: $t\to bWZ$ and $t\to hc$
• Composite dark matter phenomenology in the presence of lighter degrees of freedom
• Study of interference effects in the search for flavour-changing neutral current interactions involving the top quark and a photon or a $Z$ boson at the LHC
• OpTHyLiC: an Optimised Tool for Hybrid Limits Computation

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