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

BES Collaboration

Chinese Physics C> 1993, Vol. 17> Issue(2) : 97-106

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

BES Collaboration

Institute of High Energy Physics,Acadamia Sinica,Beijing 100039

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Abstract：
Based on the 2.5 million J/ψ's collected by the BES at BEPC,through the hadronic decay J/ψ→ωf₂(1270),f₂(1270)→π⁺π^－,ω→π⁺π^－π⁰,the properties of the resonance f₂(1270) are studied:its mass,width,and branching ratio.the angular distribution is fitted with maximum likelihood methood,determining its.J^PC=2⁺⁺ and giving in the first time the helicity amplitude ratios of this process as:x=0.99±0.29; y=－0.24±0.17; z₁=0.90±0.57;z₂=0.56±0.22.

References

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R. Brandelik et al, Phys. Lett., B74(1978), 292[2]G. Alexander et al., Phys. Letts, B72(1978), 493.[3]M. E. B. Franklin, SLAC Report, 254(1982).[4]R. M. Baltrusaitis et al., Phys. Rev., D35(1987), 2077.[5]J.-E. Augu."ain et al., Z.. Phys., 036(1987), 369.[6]C. Edwards et al., Phys. Rev., D25(1982), 3065[7]U. Mallik, Talk give at the SLAC Summer Institute on particle physics, Stanford 1986, SLAC-pub-4238(1987).[8]J.-E. Augustin et al., Proc. of the 21th Rencontrede Moriond, Les Arcs, 9-16 Match 1986, p421.[9]郁宏、沈齐兴,高能物理与核物理,14(1990),504,[10]T慧良等,高能物理与核物理,18(1992),769,[11]李惕赔著,《实验的数学处理》[12]H. G. Dosch and D. Gromes, Phys. Rev.,D33(1986), 1378.[13]M. Krammer, Phys. Letters, 74B(1978), 361.

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BES Collaboration. Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay[J]. Chinese Physics C, 1993, 17(2): 97-106.

BES Collaboration. Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay[J]. Chinese Physics C, 1993, 17(2): 97-106. shu

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Received: 1900-01-01
Revised: 1900-01-01

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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 Resonance f₂(1270) in the J/ψ Hadronic Decay

BES Collaboration

Institute of High Energy Physics,Acadamia Sinica,Beijing 100039

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1993-02-05

Abstract: Based on the 2.5 million J/ψ's collected by the BES at BEPC,through the hadronic decay J/ψ→ωf₂(1270),f₂(1270)→π⁺π^－,ω→π⁺π^－π⁰,the properties of the resonance f₂(1270) are studied:its mass,width,and branching ratio.the angular distribution is fitted with maximum likelihood methood,determining its.J^PC=2⁺⁺ and giving in the first time the helicity amplitude ratios of this process as:x=0.99±0.29; y=－0.24±0.17; z₁=0.90±0.57;z₂=0.56±0.22.