摘要
报道利用单态正电子偶素湮没，在过程ｅ＋ｅ－（１Ｓ０）→γ＋Ｕ中探测单能γ射线，寻找低质量中性粒子Ｕ的实验结果．在２σ的统计误差水平上，没有探测到Ｍｕ＜２ｍｅ的低质量中性粒子．
This paper reports the experiment result from a search for light neutral particle U by measuring the monoenergetic gamma ray in the singlet positronium annihilation: e+e-(1S0)→γ+U. No evidence for the existence of such a particle of mass Mu<2me has been found on the level of 2σ statndard deviation.
出处
《高能物理与核物理》
CSCD
北大核心
1994年第5期404-408,共5页
High Energy Physics and Nuclear Physics
