Chinese Physics C > 2012, Vol. 36 > Issue(11): 1031-1039 DOI: 10.1088/1674-1137/36/11/001

Measurement of J/ψ decays into ΛΛ π⁺π^-

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

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Abstract：
Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→Λ Λπ ⁺π ^-is observed for the first time. The branching fraction is measured to be Br(J/ψ→Λ Λπ ⁺π ^-)=(4.30±0.13±0.99)×10 ^-3, excluding the decays to intermediate states, namely J/ψ→Ξ ^- Ξ ⁺, J/ψ→Σ(1385) ^- Σ(1385) ⁺, and J/ψ→Σ(1385) ⁺ Σ(1385) ^-. The branching fractions for these intermediate resonance channels are measured to be: Br(J/ψ→Ξ ^- Ξ ⁺)=（0.90±0.03±0.18）×10 ^-3, Br(J/ψ→Σ(1385) ^- Σ(1385) ⁺)=(1.23±0.07±0.30)×10 ^-3,and Br(J/ψ→Σ(1385) ⁺ Σ(1385) ^-)=(1.50±0.08±0.38)×10 ^-3, respectively. The angular distribution is of the form d N/d(cos θ) α(1+ αcos ² θ) with α=(0.35±0.29±0.06) for J/ψ→Ξ ^- Ξ ⁺, α=(-0.54±0.22±0.10) for J/ψ→Σ(1385) ^- Σ(1385) ⁺, and α=(-0.35±0.29±0.06) for J/ψ→Σ(1385) ⁺ Σ(1385) ^-.

References

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M. Ablikim et al (BESⅡ collaboration). Measurement of J/ψ decays into ΛΛ π ⁺π ^-[J]. Chinese Physics C, 2012, 36(11): 1031-1039. doi: 10.1088/1674-1137/36/11/001

M. Ablikim et al (BESⅡ collaboration). Measurement of J/ψ decays into ΛΛ π ⁺π ^-[J]. Chinese Physics C, 2012, 36(11): 1031-1039. doi:10.1088/1674-1137/36/11/001 shu

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Received: 2012-07-16
Revised: 2012-08-16

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of J/ψ decays into ΛΛ π⁺π^-

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

Received Date:2012-07-16
Accepted Date:2012-08-16
Available Online:2012-11-05

Abstract:Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛπ⁺π^-is observed for the first time. The branching fraction is measured to beBr(J/ψ→ΛΛπ⁺π^-)=(4.30±0.13±0.99)×10^-3, excluding the decays to intermediate states, namely J/ψ→Ξ^-Ξ⁺, J/ψ→Σ(1385)^-Σ(1385)⁺, and J/ψ→Σ(1385)⁺Σ(1385)^-. The branching fractions for these intermediate resonance channels are measured to be:Br(J/ψ→Ξ^-Ξ⁺)=（0.90±0.03±0.18）×10^-3,Br(J/ψ→Σ(1385)^-Σ(1385)⁺)=(1.23±0.07±0.30)×10^-3,andBr(J/ψ→Σ(1385)⁺Σ(1385)^-)=(1.50±0.08±0.38)×10^-3, respectively. The angular distribution is of the form dN/d(cosθ)α(1+αcos²θ) withα=(0.35±0.29±0.06) for J/ψ→Ξ^-Ξ⁺,α=(-0.54±0.22±0.10) for J/ψ→Σ(1385)^-Σ(1385)⁺, andα=(-0.35±0.29±0.06) for J/ψ→Σ(1385)⁺Σ(1385)^-.