Twist-3 contributions to ${\hat{I}}^3{\hat{I}}^3\to \ddot{I}{€}^0\ddot{I}{€}^0,K_S^0{K}_S^0$ in $k_T$ factorization

Jun-Kang He, Cong Wang

We compute the cross sections for the two-photon processes ${\hat{I}}^3{\hat{I}}^3\to \ddot{I}{€}^0\ddot{I}{€}^0$ and ${\hat{I}}^3{\hat{I}}^3\to K_S^0{K}_S^0$ in $k_T$ factorization, including the chirally enhanced two-parton twist-3 lig…