Angular Distributions for the Process e+e－→J/ψ→γ+X(JPC),X→BB and Spin-Parity Analysis of the Resonance X

Zhang Lin; Yu Hong; Shen Qixing

Chinese Physics C> 1996, Vol. 20> Issue(3) : 280-285

Angular Distributions for the Process e⁺e^－→J/ψ→γ+X(J^PC),X→BB and Spin-Parity Analysis of the Resonance X

Institute of High Energy Physics, The chinese Academy of Sciences,Beijing 100039

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Abstract：
Using the helicity angular distribution method we analyse the process e⁺e^－→J/ψ→γ+X(J^PC),X→BB. The angular and the projection angular distribution formulas for different spin-parity of the resonance X are obtained. With these formulas, we determine the spin of the resonance X through analysing experimental data.

References

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P.G.O.Freund,F.Walthz,J.Rosner,Nucl Phys,B13（1969）237.[2] P.Henrard,P CC F,R I87-03（1987）[3] JS.Brown,P HD Thesis,U MI84-19117-mc（unpublished）[4]金山，在J/ψ衰变中研究ξ（2230）粒子，中科院高能物理所博士论文。[5]郁宏，高能物理与核物理，13（1989）87;郁宏、沈齐兴，高能物理与核物理，17（1993）892.[6] A.Etkin et al.,Phys Rev.,Lett,49（1982）1620.[7]沈齐兴、郁宏，高能物理与核物理，14（1990）504.

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Zhang Lin, Yu Hong and Shen Qixing. Angular Distributions for the Process e⁺e^－→J/ψ→γ+X(J^PC),X→BB and Spin-Parity Analysis of the Resonance X[J]. Chinese Physics C, 1996, 20(3): 280-285.

Zhang Lin, Yu Hong and Shen Qixing. Angular Distributions for the Process e⁺e^－→J/ψ→γ+X(J^PC),X→BB and Spin-Parity Analysis of the Resonance X[J]. Chinese Physics C, 1996, 20(3): 280-285. shu

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

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