$\mathcal{O}({\alpha }^3{\alpha }_s)$ Study on the yields and polarizations of $J/\psi ({\rm Y})$ within the framework of non-relativistic QCD via $\gamma \gamma \to J/\psi ({\rm Y})+\gamma +X$ at CEPC

Zhan Sun, Xiong Deng, Hai Bing Fu

Within the framework of the non-relativistic QCD (NRQCD), we make a systematical study of the yields and polarizations of $J/\psi$ and ${\rm Y}$ via $\gamma \gamma \to J/\psi ({\rm Y})+\gamma +X$ in photon-photon coll…