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Next-to-Next-to-Leading Order QCD Corrections to $η_t \to HZ$
Motivated by recent LHC observations of a threshold enhancement in the $t\bar t$ system consistent with toponium-like dynamics, we compute the next-to-next-to-leading order (NNLO) QCD correction to the hard short-distance coefficient for $η_t\to HZ$, where $η_t$ denotes the pseudoscalar color-single
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