Chinese Physics C > 1998, Vol. 22 > Issue(2): 97-105

ΛΛ,ΛΛγ and ΛΛπ⁰Productions in J/ψ Decay

BES Collaboration

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

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Abstract：
The channels of J/ψ decay into,ΛΛ,ΛΛγ and ΛΛπ ⁰are analyzed with 7.8×10 ⁶J/ψ events collected by BES detector at BEPC Collider.The branching ratios for three channels and the angular distribution for the first channel are measured.The branching ratios are Br(J/ψ→ΛΛ)=(l.08±0.06±0.24)×10 ^－3,Br(J/ψ→ΛΛγ) －4(90% CL)and Br(J/ψ→ΛΛπ ⁰)=(2.3±0.7±0.8)×l0 ^－4respectively. The angular distribution for J/ψ→ΛΛ is dN dcosθ=N ₀(1+αcos ²0),α=0.52±0.33±0.13.

References

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Brodsky S L, Lepage G P. Phys. Rev., 1981, D24:2848[2] Claudson M, Giashow S L, Wise M B. Phys. Rev., 1982, D25: 1345[3] Carimalo C. Int J. Mod. Phys., 1987, A2:249[4] Peruzzi I et al. Phys. Rev., 1978, D17:2901[5] Eaton M W et al. Phys. Rev., 1984, D29:804[6] Pallin D et al. Nucl. Phys., 1987, B292:653

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BES Collaboration. ΛΛ,ΛΛγ and ΛΛπ ⁰Productions in J/ψ Decay[J]. Chinese Physics C, 1998, 22(2): 97-105.

BES Collaboration. ΛΛ,ΛΛγ and ΛΛπ ⁰Productions in J/ψ Decay[J]. Chinese Physics C, 1998, 22(2): 97-105. 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

ΛΛ,ΛΛγ and ΛΛπ⁰Productions in J/ψ Decay

BES Collaboration

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

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1998-02-05

Abstract:The channels of J/ψ decay into,ΛΛ,ΛΛγ and ΛΛπ⁰are analyzed with 7.8×10⁶J/ψ events collected by BES detector at BEPC Collider.The branching ratios for three channels and the angular distribution for the first channel are measured.The branching ratios are Br(J/ψ→ΛΛ)=(l.08±0.06±0.24)×10^－3,Br(J/ψ→ΛΛγ) －4(90% CL)and Br(J/ψ→ΛΛπ ⁰)=(2.3±0.7±0.8)×l0 ^－4respectively. The angular distribution for J/ψ→ΛΛ is dN dcosθ=N ₀(1+αcos ²0),α=0.52±0.33±0.13.