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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

  • 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.
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  • 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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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.

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