Received 22 June 2018, Published online 19 October 2018 ∗ Supported by National Natural Science Foundation of China (11435004), the Chinese-Hungarian bilateral cooperation program (Te’T 12CN-1-2012-0016) and the CCNU PhD Fund 2016YBZZ100 of China 1) E-mail: jiangzf@mails.ccnu.edu.cn 2) E-mail: cbyang@mail.ccnu.edu.cn ©2018 Chinese Physical Society and the Institute of High Energy Physics Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd