摘要
北京谱仪合作组最近获得τ粒子质量的最新结果为该值比以前的粒子表给出值小 ７．２ＭｅＶ，精度提高了 ５－７倍，为解决τ寿命、衰变分支比和轻子普适性理论的矛盾向前迈进了一大步．
A new measurement by the Beijing Spectrometer Group has obtained a value of 1776 9 ± 0.5MeV for the mass of the τ particle. This value ls less than that given by the PDG (P- article Data Group) data by 7.2MeV. The measurement precision is 5 times better than pr- eviously, and the result is a big stride forward in resolving the contradiction among the τ lifetime, the τ leptonic branching ratio and the lepton universality
出处
《物理》
CAS
北大核心
1993年第1期1-3,共3页
Physics
