Next-to-leading order QCD corrections to $\chi_{cJ} W^+ b$ associated   production from top-quark decay
  We calculate the next-to-leading order QCD corrections to the excited charmonium $\chi_{cJ}$ associated with $ W^+ b $ production from top-quark decay. Our results show that detecting the $\chi_{c0}$ production from top-quark decay is very difficult, but the $\chi_{c1}$ and $\chi_{c2}$ productions have the potential to be detected at the LHC. If the prompt $\chi_{cJ}$ production from top-quark decay is really detected at the LHC, it will be useful not only for investigating $J/\psi$ production from top-quark decay but also for understanding the heavy quarkonium production mechanism. 
Zhou Chao, Li Gang, Song Mao, Ma Wen-Gan, Zhang Ren-You
hep-ph