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

He Jingtang; Zhu Guoyi; La Yusheng; Dong Xiaoli

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《中国物理C》（英文）编辑部

2024年10月30日

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]	LIU Xi-Ming , SUN Xu-Bin . Strangeness Suppression in e⁺e^－ Light Flavour Jets. Chinese Physics C, 2007, 31(2): 138-142.
[2]	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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[4]	JIN Yi , LI Shi-Yuan , XIE Qu-Bing . Fragmentation of Light Initial Quarks into Charm Measons in e⁺e^－ Annihilation. Chinese Physics C, 2003, 27(10): 852-856.
[5]	WANG Hai-Long , LIU Xi-Ming , WANG Yu-Shui . Mass Dependence of Hadron Production Rates in e⁺e^－ Annihilations at High Energy. Chinese Physics C, 2002, 26(5): 471-476.
[6]	BES Collaboration . Measurement of Production Cross Section of D_s⁺D_s^－ in e⁺e^－ Annihilation at the Center-of-Mass Energy of s=4.03GeV. Chinese Physics C, 2001, 25(6): 465-475.
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[10]	Wang Qun , Xie Qubing . Production Percentages of L=1 Excited Baryons in e⁺e^－ Annihilation. Chinese Physics C, 1994, 18(9): 807-812.
[11]	Liu Ximing . Difference of Particle Multiplicities Between Quark Jets of Different Flavors in e⁺e^－ Annihilation. Chinese Physics C, 1994, 18(9): 829-835.
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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.