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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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→ ωf ₂(1270),f ₂(1270) → π ⁺ π ^-, ω→ π ⁺ π ^- π ⁰, we studied the properties of the resonance f ₂(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, z ₁=0.90 ±0,57, z ₂=0.56 ±022.

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BES Collaboration. Experimental Study of f ₂(1270) in the J/ψ Hadronic Decay[J]. Chinese Physics C, 1992, 16(S4): 385-393.

BES Collaboration. Experimental Study of f ₂(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-parityJ^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.