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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.
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                        References
	
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				| [1] | HU Xi-Duo
								, SHAO Ming-Zhu
								, LUO Shi-Yu
								, LIU Yong-Sheng
								, ZHU De-Hai
								. Average Field Idea and Single Particle Model for 2 Dimension Crystallization Beams(Ⅱ). Chinese Physics C,
							2004, 28(2): 196-199. |  
				| [2] | LI Ming-Liang
								, ZHU Sheng-Jiang
								, CHE Xing-Lai
								, YU Ying-Nan
								. Research on Two-Quasiparticle Bands in 98Sr. Chinese Physics C,
							2004, 28(S1): 75-77. |  
				| [3] | Yu Hong
								, Shen Qixing
								, Zhang Lin
								. Angular Distribution of Process e+e-→τ+τ-,τ-→a1υτ,a1→ρπ and Characteristics of a1 Meson. Chinese Physics C,
							1994, 18(7): 583-590. |  
 
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