A new decay mode of higher charmonium Li-Ye Xiao, Xin-Zhen Weng, Qi-Fang Lü, Xian-Hui Zhong and Shi-Lin Zhu Eur. Phys. J. C, 78 7 (2018) 605 Published online: 28 July 2018 DOI: 10.1140/epjc/s10052-018-6087-3