Abstract： By using the new result of τ-mass from Beijing spectrometer and the data of τ→5πvτ from ARGUS, the upper limit of vτ-mass of 30 MeV is obtained at 95% confidence level. The upper limit of the vτ-mass could be largely reduced if a high resolution detector is used in the improved Beijing electron positron collider, which is under discussion.
DU Dongsheng;GU Jianhui;HUANG Tao;JIN Shan;LI Jin;LIU Chun. A Study of the Upper Limit of vτ-Mass at BEPC[J]. 中国物理快报, 1993, 10(2): 83-85.
DU Dongsheng, GU Jianhui, HUANG Tao, JIN Shan, LI Jin, LIU Chun. A Study of the Upper Limit of vτ-Mass at BEPC. Chin. Phys. Lett., 1993, 10(2): 83-85.
1993, Vol. 10 
