Next-to-Next-to-Leading Order QCD Corrections to ${\eta }_t\to HZ$

Cai-Ping Jia, Yan-Qing Ma, Huai-Min Yu +1

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)…