Chinese Physics C > 1994, Vol. 18 > Issue(5): 404-408

Search for Light Neutral Particle in Low Energy e⁺e^－Annihilation

Institute of High Energy Physics, Academia Sinica, Beijing 1100039

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Abstract：
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.

References

[1]	P.Fayet and M.Mezard,Phys.Lett,104B（1981）226.[2]G,Carboni,Phys.Lett,101B（1981）444.[3]G.Carboni and W.Dahme,Phys.Lett,123B（1983）349.[4]U.Amaldi et al.Phys.Lett,153B（1985）444.[5]Tang Xiaowei,Chinese Phys.Lett,,4（1987）1.[6]朱永生，实验物理中的概率和统计，科学出版社，（1991）398页。

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He Jingtang, Zhu Guoyi, La Yusheng and Dong Xiaoli. Search for Light Neutral Particle in Low Energy e ⁺e ^－Annihilation[J]. Chinese Physics C, 1994, 18(5): 404-408.

He Jingtang, Zhu Guoyi, La Yusheng and Dong Xiaoli. Search for Light Neutral Particle in Low Energy e ⁺e ^－Annihilation[J]. Chinese Physics C, 1994, 18(5): 404-408. shu

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Received: 1900-01-01
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Search for Light Neutral Particle in Low Energy e⁺e^－Annihilation

Corresponding author:He Jingtang,

Institute of High Energy Physics, Academia Sinica, Beijing 1100039

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1994-05-05

Abstract: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.