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Minimal cascade decay of the top quark through a new scalar
We explore a possible decay of the top quark into a new scalar $ϕ_t$ plus a charm quark. The decay is mediated by a dimension-5 operator that may be generated by the exchange of a heavy vectorlike quark, $χ$, and can have a branching fraction close to a percent. In a minimal model, $ϕ_t$ decays due
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