Experimental Study of f<sub>2</sub>(1270) in the J/ψ Hadronic Decay

BES Collaboration

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《中国物理C》（英文）编辑部

2024年10月30日

Chinese Physics C> 1992, Vol. 16> Issue(S4) : 385-393

Experimental Study of f₂(1270) in the J/ψ Hadronic Decay

BES Collaboration

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Abstract：
Based on the 2.5 million J/ψ's collected by the Beijing spectrometer at the Beijing electron positron collider, through the hadronic decay J/ψ → ωf₂ (1270),f₂(1270) → π⁺π^-, ω→π⁺π^-π⁰, we studied the properties of the resonance f₂(1270):the mass,width, and branching ratio. The angular distribution is Otted with the maximum likelihood method, determining its spin-parity J^PC=2⁺⁺, and giving for the first time the helicity amplitude ratios of this process as:x=0.99 ±0.29, y=-0.24 ±017, z₁=0.90 ±0,57, z₂=0.56 ±022.

[1]	HE Zhan-Ying , ZHOU Jian-Rong , SUN Zhi-Jia , YANG Gui-An , XU Hong , WANG Yan-Feng , LIU Qian , LIU Hong-Bang , CHEN Shi , XIE Yi-Gang , ZHENG Yang-Heng , WANG Xiao-Dong , ZHANG Xiao-Dong , HU Bi-Tao , CHEN Yuan-Bo . Experimental studies of THGEM in different Ar/CO₂ mixtures. Chinese Physics C, 2014, 38(5): 056003. doi: 10.1088/1674-1137/38/5/056003
[2]	Ali N , Atashbar Tehrani . Jacobi polynomials and non-singlet structure function F₂(x,Q²) up to N³LO. Chinese Physics C, 2010, 34(9): 1479-1481. doi: 10.1088/1674-1137/34/9/077
[3]	LU Zhun . Comparing AdS/CFT dipole model to HERA F₂ data. Chinese Physics C, 2010, 34(9): 1421-1424. doi: 10.1088/1674-1137/34/9/060
[4]	ZHONG Bin , PING Rong-Gang , XIAO Zhen-Jun . Study of Λ decay parameter in J/ψ→ΛΛ decay. Chinese Physics C, 2008, 32(9): 692-696. doi: 10.1088/1674-1137/32/9/003
[5]	ZHU Wen-Han , ZHAO Yan-E , ZHANG Yun-Long , XU Zi-Zong , WANG Xiao-Lian . Experimental study of multi-photon contamination on the measurement offluorescent decay time. Chinese Physics C, 2008, 32(11): 912-915. doi: 10.1088/1674-1137/32/11/013
[6]	ZHANG Yong-Jun , ZOU Bing-Song . Is f₀ Distinguishable from f₂ by One-dimensional Projections of Angular Distributions in J/ψ→f_{J_→ππKK?}. Chinese Physics C, 2004, 28(5): 479-486.
[7]	LI DeMin , FANG Jian , YU Hong , SHEN QiXing . Mixing of the Neutral Tensor Mesons f₂(1270),f′₂(1525) and the Glueball Candidate ξ(2230). Chinese Physics C, 2000, 24(5): 451-456.
[8]	Yu Hong , Shen Qixing . Multichannel Coupling in the Hadronic Decay Process J/ψ→ωπ⁺π^-. Chinese Physics C, 1997, 21(S1): 447-454.
[9]	Chen Guoming , Chen Gang . Identifying τ Hadronic Decay with Neutral Network. Chinese Physics C, 1995, 19(S3): 247-256.
[10]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.
[11]	Qixing Shen , Hong Yu . Spin and Parity Analysis for the Three-Step Two-Body Hadronic Decay Processes of J/ψ. Chinese Physics C, 1992, 16(S1): 41-50.
[12]	Shen Qinxing , Yu Hong . Angular Distributions Analysis for the Hadronic Decay Process. Chinese Physics C, 1992, 16(S4): 401-410.
[13]	Zhang Tianbao , Yang Guangming , Guo Baonian , Wang Haidong . Experimental Investigation of the Decay Rate of Orthopositronium. Chinese Physics C, 1992, 16(S2): 135-140.
[14]	Yu Hong , Shen Qixing . A Study on the Polarization Structure of J/ψ →ωf₂(1270) Decay Process. Chinese Physics C, 1992, 16(S3): 277-280.
[15]	YU Hong , SHEN Qi-Xing . Study of the Polarization of J/ψ→ωf₂(1270) Decay Process. Chinese Physics C, 1992, 16(9): 861-864.
[16]	Yu Hong , Shen Qixing . J/ψ Hadronic Decay and 1^-+ Exotic State. Chinese Physics C, 1991, 15(S3): 283-287.
[17]	Yu Hong , Shen Qixing . A Moment Analysis for the J/ψ Hadronic Decay Processes. Chinese Physics C, 1990, 14(S4): 353-360.
[18]	Yu Hong , Shen Qixin . Helicity Formalism of the Angular Distribution for the J/ψ Hadronic Decay Processes. Chinese Physics C, 1990, 14(S3): 259-263.
[19]	YU Hong , SHEN Qi-Xing , WANG Xu . d WAVE COMPONENTS OF THE GLUEBALL CANDIDATE θ/f₂(1720) AND POSSIBLE EXPERIMENTAL TEST. Chinese Physics C, 1989, 13(11): 996-1002.
[20]	Yu Hong , Shen Qixing , Wang Xiu . D-Wave Components of the Glueball Candidate θ/f₂ (1720) and a Possible Experimental Test. Chinese Physics C, 1989, 13(S4): 385-392.

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BES Collaboration. Experimental Study of f₂(1270) in the J/ψ Hadronic Decay[J]. Chinese Physics C, 1992, 16(S4): 385-393.

BES Collaboration. Experimental Study of f₂(1270) in the J/ψ Hadronic Decay[J]. Chinese Physics C, 1992, 16(S4): 385-393. shu

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Received: 1992-09-15

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Supported by the National Natural Science Foundation of China.

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental Study of f₂(1270) in the J/ψ Hadronic Decay

BES Collaboration

Received Date: 1992-09-15

Fund Project: Supported by the National Natural Science Foundation of China.

Abstract: Based on the 2.5 million J/ψ's collected by the Beijing spectrometer at the Beijing electron positron collider, through the hadronic decay J/ψ → ωf₂ (1270),f₂(1270) → π⁺π^-, ω→π⁺π^-π⁰, we studied the properties of the resonance f₂(1270):the mass,width, and branching ratio. The angular distribution is Otted with the maximum likelihood method, determining its spin-parity J^PC=2⁺⁺, and giving for the first time the helicity amplitude ratios of this process as:x=0.99 ±0.29, y=-0.24 ±017, z₁=0.90 ±0,57, z₂=0.56 ±022.