Flavour-changing top decays in the aligned two-Higgs-doublet model

Abstract

We perform a complete one-loop computation of the two-body flavour-changing top decays $t\to ch$ and $t\to cV$ ($V=\gamma ,Z$), within the aligned two-Higgs-doublet model. We evaluate the impact of the model parameters on the associated branching ratios, taking into account constraints from flavour data and measurements of the Higgs properties. Assuming that the $125$~GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving aligned two-Higgs-doublet model, we find that the rates for such flavour-changing top decays lie below the expected sensitivity of the future high-luminosity phase of the LHC. Measurements of the Higgs signal strength in the di-photon channel are found to play an important role in limiting the size of the $t\to ch$ decay rate when the charged scalar of the model is light.

arXiv comment24 pages, 5 figures, 10 tables; more discussions and references added, version accepted by JHEP

References in corpus (31)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Theory and phenomenology of two-Higgs-doublet models
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Review of lattice results concerning low energy particle physics
• Yukawa Alignment in the Two-Higgs-Doublet Model
• Measurement of the Higgs boson mass from the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ channels with the ATLAS detector using 25 fb${}^{-1}$ of $pp$ collision data
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Electric Dipole Moments in Two-Higgs-Doublet Models
• Charged-Higgs phenomenology in the Aligned two-Higgs-doublet model
• A global approach to top-quark flavor-changing interactions
• Unraveling models of CP violation through electric dipole moments of light nuclei
• Search for a light charged Higgs boson in the decay channel H+->csbar in ttbar events using pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Inclusive semileptonic fits, heavy quark masses, and V_cb
• Renormalization-group constraints on Yukawa alignment in multi-Higgs-doublet models
• Snowmass 2013 Top quark working group report
• Scrutinizing h(125) in Two Higgs Doublet Models at the LHC, ILC, and Muon Collider
• $B_{s,d}^0\to {\ell }^{+}{\ell }^{-}$ Decays in the Aligned Two-Higgs-Doublet Model
• Disentangling Flavor Violation in the Top-Higgs Sector at the LHC
• Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model
• A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV
• Status of the aligned two-Higgs-doublet model confronted with the Higgs data
• Search for Charged Higgs bosons: Combined Results Using LEP Data
• Yukawa alignment from natural flavor conservation
• The Top Mass: Interpretation and Theoretical Uncertainties
• Yukawa Alignment in a Multi Higgs Doublet Model: An effective approach
• Family symmetries and alignment in multi-Higgs doublet models
• Effective Aligned 2HDM with a DFSZ-like invisible axion
• Top quark anomalous tensor couplings in the two-Higgs-doublet models
• Phenomenology of the Basis-Independent CP-Violating Two-Higgs Doublet Model [Dissertation]
• Search for FCNC in top quark production and decays
• Natural Quasi-Alignment with two Higgs Doublets and RGE Stability

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