$O({\alpha }_s{v}^2)$ correction to pseudoscalar quarkonium decay to two photons

Yu Jia, Xiu-Ting Yang, Wen-Long Sang +1

We investigate the $O({\alpha }_s{v}^2)$ correction to the process of pseudoscalar quarkonium decay to two photons in nonrelativistic QCD (NRQCD) factorization framework. The short-distance…