New gauge boson and radiative leptonic decays of charged B and D mesonsYa-Bing Zuo, Chong-Xing Yue, Wei Yang, Yan-Nan Hao and Wei-Rong ZhangEur. Phys. J. C, 78 7 (2018) 571DOI: https://doi.org/10.1140/epjc/s10052-018-6044-1