1. Department of Physics, Guizhou Minzu University, Guiyang 550025, China
2. SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94039, USA
3. Department of Physics, Chongqing University, Chongqing 401331, China
4. Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications, School of Physics and Electronics, Hunan University, Changsha 410082, China
5. Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy
6. INFN, Sezione di Milano-Bicocca, 20126 Milano, Italy