$O({\alpha }_s{v}^2)$ Corrections to Hadronic and Electromagnetic Decays of ${}^1{S}_0$ Heavy Quarkonium

Huai-Ke Guo, Yan-Qing Ma, Kuang-Ta Chao

We study $O({\alpha }_s{v}^2)$ corrections to decays of ${}^1{S}_0$ heavy quarkonium into light hadrons and two photons within the framework of nonrelativistic QCD, and find these $O({\alpha }_s{v}^2)$ co…