Search for Light Neutral Particle in Low Energy e<SUP>+</SUP>e<SUP>－</SUP> Annihilation

He Jingtang; Zhu Guoyi; La Yusheng; Dong Xiaoli

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

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[1]	HE Kang-Lin , MO Xiao-Hu , WANG Ping , YUAN Chang-Zheng . Experimental Searches for the Non-DD Decays of ψ(3770) in e⁺e^－ Collider. Chinese Physics C, 2007, 31(2): 125-137.
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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.