Determination of the number of J/ψ events with inclusive J/ψ decays

作者：Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Ferroli, R. Baldini; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, H. Y.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, X.; Chen, X. R.; Chen, Y. B.

来源：Chinese Physics C, 2017, 41(1): 013001.

DOI：10.1088/1674-1137/41/1/013001

• number of J/psi events
• BESIII detector
• inclusive J/psi events

A measurement of the number of J/psi events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the J/psi. The number of J/psi events taken in 2009 is recalculated to be (223.7 +/- 1.4) x 10(6), which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. The number of J/psi events taken in 2012 is determined to be (1086.9 +/- 6.0) x 10(6). In total, the number of J/psi events collected with the BESIII detector is measured to be (1310.6 +/- 7.0) x 10(6), where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible.

• 出版日期2017-1
• 单位湖南大学; 郑州大学; 河南师范大学; 四川大学; 中国科学院大学; 河南大学; 清华大学; 北京大学; 苏州大学; 山东大学; 南开大学; 辽宁大学; 南京师范大学; 北京航空航天大学; 华中师范大学; 北京石油化工学院; 兰州大学; 杭州师范大学; 山西大学; 浙江大学; 南京大学; 武汉大学; 南华大学; 黄山学院; 广西师范大学; 上海交通大学; 中山大学