The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions

Xiang-Peng Wang, Deshan Yang

In this paper, we calculate twist-2 light-cone distribution amplitudes (LCDAs) of the S-wave and P-wave quarkonia (namely ${}^1{S}_0$ state ${\eta }_Q$, ${}^3{S}_1$ state $J/\psi ({\rm Y})$, ${}^1{P}_1$ sta…