Study of and from 4.66 to 4.95 GeV
M. Ablikim (Institute of High Energy Physics, Beijing 100049, People’s Republic of China); M. N. Achasov (Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia); P. Adlarson (Uppsala University, Box 516, SE-75120 Uppsala, Sweden); O. Afedulidis (Bochum Ruhr-University, D-44780 Bochum, Germany); X. C. Ai (Zhengzhou University, Zhengzhou 450001, People’s Republic of China); et al - Show all 658 authors
Using data samples with an integrated luminosity of collected by the BESIII detector at center-of-mass energies ranging from 4.66 GeV to 4.95 GeV, we study the processes of and . With the process, the branching fraction ratio is measured to be ( at 90% confidence level). In addition, we measure the ratio of the average cross section of to to be . Finally, we search for the process of , and no obvious signal is observed. The upper limit on the ratio of the average cross section of to is set as at 90% confidence level.