Study of color-octet matrix elements through production in annihilationYi-Jie Li, Guang-Zhi Xu, Pan-Pan Zhang, Yu-Jie Zhang and Kui-Yong LiuEur. Phys. J. C, 77 9 (2017) 597DOI: https://doi.org/10.1140/epjc/s10052-017-5120-2