Higgs FCNC h -> t* c decay at the muon collider

Abstract

We study the discovery potential of the flavor-changing neutral coupling (FCNC) htc of the Higgs boson and the top quark through the rare tree-body decay h -> Wbc at Muon colliders for a light Higgs boson with mass 114 < m_h < 145 GeV. This decay mode may compete with the SM background induced by the hWW coupling in some models with a tree-level htc coupling and with models that predict this coupling at the one-loop level in the range 10^{-2} - 10^{-1}. A future muon collider could test the scalar FCNC decay t -> hc via Higgs decay h -> t* c -> b W+ c down to values of the coupling g_{tc}=0.5 (that are equivalent to BR(t -> hc) = 5 x 10^{-3}). The LHC could probe values of g_{tc} one order of magnitude smaller, unless other processes beyond the SM appear that through intense multi jet activity may clutter the t -> hc signal.

8 pages, 3 figures. References added

References in corpus (6)

• Revisiting the Global Electroweak Fit of the Standard Model and Beyond with Gfitter
• New Physics effects in the flavor-changing neutral couplings of the Top quark
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• The "Top Priority" at the LHC
• FCNC-induced heavy-quark events at the LHC from Supersymmetry
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Cited by in corpus (7)

• Theory of neutrinoless double beta decay
• Nuclear matrix elements for neutrinoless double-beta decay and double-electron capture
• Limits on the anomalous $Wtq$ couplings
• The γγ\to ϕ_iϕ_j processes in the type-III two-Higgs-doublet model
• Flavor violating leptonic decays of the Higgs boson
• Rare Higgs three body decay induced by top-Higgs FCNC coupling in the littlest Higgs Model with T-parity
• Exploring Anomalous Flavor-Changing Neutral tqh Transitions at Future Muon Colliders: Insights from ${\mu }^{+}{\mu }^{-}\to t\bar{q}h$ Interactions