|
|||||
|
|
Search for invisible decays of eta and eta' in J/psi --> phi eta and phi eta' |
|
| Authors: | Ablikim M Bai J Z Ban Y Bian J G Cai X Chen H F Chen H S Chen H X Chen J C Chen Jin Chen Y B Chi S P Chu Y P Cui X Z Dai Y S Diao L Y Deng Z Y Dong Q F Du S X Fang J Fang S S Fu C D Gao C S Gao Y N Gu S D Gu Y T Guo Y N Guo Y Q Guo Z J Harris F A He K L He M Heng Y K Hu H M Hu T Huang G S Huang X T Ji X B Jiang X S Jiang X Y Jiao J B Jin D P Jin S Jin Yi Lai Y F Li G Li H B Li H H Li J Li R Y Li S M Li W D Li W G Li X L Li X N Li X Q Li Y L Liang Y F Liao H B Liu B J Liu C X Liu F Liu Fang Liu H H Liu H M Liu J Liu J B Liu J P Liu Q Liu R G Liu Z A Lou Y C Lu F Lu G R Lu J G Luo C L Ma F C |
| Institution: | Institute of High Energy Physics, Beijing 100049, People's Republic of China. |
| Abstract: | Using a data sample of 58 x 10(6) J/psi decays collected with the Beijing Spectrometer II detector at the Beijing Electron Positron Collider, searches for invisible decays of eta and eta' in J/psi to phi eta and phi eta' are performed. The phi signals, which are reconstructed in K+K- final states, are used to tag the eta and eta' decays. No signals are found for the invisible decays of either eta or eta', and upper limits at the 90% confidence level are determined to be 1.65 x 10(-3) for the ratio B(eta-->invisible)/B(eta --> gamma gamma) and 6.69 x 10(-2) for B(eta' --> invisible)/B(eta' --> gammagamma). These are the first searches for eta and eta' decays into invisible final states. |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ | |